Patent Publication Number: US-10768116-B2

Title: Multi-fluid test strip

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 14/929,953 filed Nov. 2, 2015, U.S. Pat. No. 10,281,407, entitled “Multi-Fluid Test Strip”, which is incorporated herein by reference in its entirety. 
     The present application is related to: 
     U.S. Pat. No. 6,651,487, entitled TEST FOR BRAKE FLUID AGE AND CONDITION, which issued on Nov. 25, 2003; 
     U.S. Pat. No. 6,691,562, entitled TEST FOR BRAKE FLUID AGE AND CONDITION, which issued on Feb. 17, 2004; 
     U.S. Pat. No. 6,796,339, entitled APPARATUS FOR FLUSHING, REPLACING FLUID AND BLEEDING HYDRAULIC SYSTEMS, which issued on Sep. 28, 2004; 
     U.S. Pat. No. 7,152,636, entitled BRAKE FLUSH ACCELERATOR, which issued on Dec. 26, 2006; 
     U.S. Pat. No. 7,682,834, entitled COLORIMETRIC TEST FOR BRAKE FLUID, which issued on Mar. 23, 2010; 
     U.S. Pat. No. 8,021,890, entitled COLORIMETRIC TEST FOR BRAKE SYSTEM CORROSION, which issued on Sep. 20, 2011; 
     U.S. Pat. No. 8,216,849, entitled COLORIMETRIC TEST FOR BRAKE SYSTEM CORROSION, which issued on Jul. 10, 2012; and 
     U.S. Pat. No. 8,464,763, entitled BRAKE FLUSH MACHINE, which issued on Jun. 18, 2013. 
     The foregoing documents are incorporated by reference as though set forth herein in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to testing fluids. More specifically, the present disclosure relates to a multi-fluid test strip that may test various aspects of multiple fluids, such as brake fluid and coolant fluid. 
     BACKGROUND 
     Brake fluid is used to transmit the pressure exerted on a motor vehicle&#39;s brake pedal to the slave cylinders of the braking system. The most commonly used brake fluids in North America consist of glycol-based liquids categorized as DOT3 and DOT4 based on the boiling point resulting from their particular composition. In order to prevent boiling of the fluid caused by overheating during use, DOT3 and DOT4 fluids are required to have a dry boiling point (with no moisture in fluid) of at least 401° F. (205° C.) and 446° F. (230° C.), respectively, so that proper brake operation is ensured under all temperature conditions. 
     All types of glycol-based brake fluid are hygroscopic. As a result of this property, they readily absorb moisture that reduces their boiling point. 
     Another important aspect of brake systems maintenance is the corrosive nature of some of their constituents, which, upon contamination of the brake fluid, progressively contribute to damage of metallic tubing and other parts of the brake system. Most brake lines consist of steel lined with a copper alloy. Brake lines typically represent the largest surface area of metal in contact with brake fluid. A typical light-duty vehicle uses about 14 meters of such copper-lined steel tubing with an inside diameter of about 2.5 mm, for a total internal surface area of about 1,200 cm 2 . Therefore, corrosion of these lines contributes relatively large amounts of copper ions to the fluid. The master and slave cylinders and antilock brake system (ABS) include components made of steel, aluminum, zinc, or other materials that are also susceptible to corrosion as the fluid ages, its water content increases and its reserve alkalinity decreases. Dissolved iron is also known to appear in brake fluid after the initial amine corrosion inhibitor is significantly depleted and the dissolved copper level reaches about 200 ppm. By the time this event occurs, the brake fluid is highly corrosive and damaging to the brake system and its replacement is called for regardless of its actual service time or mileage. 
     Corrosion inhibitors in new brake fluid inhibit corrosion initially. In conventional brake fluids, amines are included in the new brake fluid to inhibit corrosion and prevent damage to metal parts that operate in contact with the fluid. Corrosion inhibitors deplete with time, temperature, and environmental stress (for example, air, moisture, salts, ions, and other contaminants seeping into the fluid). As the corrosion inhibitors deplete, corrosion accelerates. As the brake fluid ages, its anticorrosive properties are measured in terms of reserve alkalinity; that is, the amount of amines remaining in the fluid to buffer the pH, or acidity, resulting from breakdown of fluid constituents. Over time, thermal oxidation and volatization produce a significant reduction of the amine content and the concurrent decrease of anticorrosive properties. Tests have shown that the reserve alkalinity of DOT3 and DOT4 fluids is reduced to about 20 percent of its original value after 18 to 20 months of normal operation. 
     Corrosion in the brake system is harmful, and at some point, internal corrosion may interfere with the proper operation of the brakes or antilock brake system (ABS). Copper deposition onto brake system components, particularly ABS seats and valves, is also undesirable and may interfere with the proper operation of the brakes or ABS. A finite level of copper ions in brake fluid with water will cause corrosion of ferrous metals like iron, cast iron, steel, and the like in the brake system. The level of copper ions in brake fluid with water (as low as 2% water) is an indicator of the virtual age of the brake fluid and the potential for corrosion of ferrous metals. 
     Copper is of interest in brake system corrosion because copper can form stable ions in water-free (dry) inhibited commercial brake fluid, and thus copper can begin corroding immediately upon contact with brake fluid in the presence of oxygen. Copper is also an oxidizer for other metals. Iron ions, on the other hand, have limited solubility in dry commercial brake fluid. Iron begins to corrode when brake fluid takes on water and/or the corrosion inhibitors become depleted. Iron may be oxidized by oxygen, water, and copper ions in the brake fluid. Copper oxidizes iron in the same manner as oxygen, with a copper ion gaining an electron from an iron atom, plating or depositing a copper atom on or near the iron substrate, and releasing an iron ion into solution. The copper level in brake fluid is directly proportional to the corrosivity of the brake fluid, or its potential corrosivity. 
     However, copper is not the only species of interest in brake system corrosion. Iron, zinc, tin, aluminum, and brass (an alloy of copper and zinc) are also found in brake systems, and these materials are susceptible to corrosion. Any of these materials, or their ions, may be referred to as a reactive constituent of brake fluid because of their susceptibility to corrosion. 
     Therefore, brake fluids also need to be checked and periodically replaced in order to prevent dangerous corrosion in the brake system. Accordingly, industry maintenance recommendations, where such exist, are typically based on service time and mileage of the vehicle. 
     U.S. Pat. No. 6,691,562 discloses an approach for estimating service time and/or mileage of brake fluid based on the recognition that the copper content in brake fluid is predictably related to time and mileage of vehicle operation. Thus, this correlation can be advantageously used to estimate milestones for maintenance purposes without regard to actual service time and/or mileage. Instead, copper content is adopted as a reliable indicator of a brake system&#39;s or a vehicle&#39;s “virtual age,” a term used to refer to the wear and tear on brake fluid resulting from actual mileage, actual service conditions, and/or time of service. 
     In addition to brake fluid, most automobiles also use a coolant fluid to remove waste heat from the engine. Coolant fluids are typically a mixture of water and a glycol based antifreeze (such as ethylene glycol or propylene glycol) that also includes corrosion inhibitors to help protect the vehicles&#39; radiator from a range of electrochemically incompatible metals such as aluminum, cast iron, copper, brass, solder, and the like. 
     When ethylene glycol is used in a radiator system, it may become oxidized to five organic acids: formic, oxalic, glycolic, glyoxalic, and acetic acid. Inhibited ethylene glycol antifreeze mixes are available, with additives that buffer the pH and reserve alkalinity of the solution to prevent oxidation of ethylene glycol and formation of these acids. Nitrites, silicates, theodin, borates and azoles may also be used to prevent corrosive attack on metal. However, over time, these pH buffers typically become depleted along with the reserve alkalinity of the coolant fluid as pH levels drop and acidity rises. When this occurs, the coolant fluid should be changed in order to avoid damage to the vehicles&#39; radiator system. 
     Improper mixing or ratios of glycol-based antifreezes is another issue that commonly arises with mixed coolant fluids. For example, ratios of 50% glycol based antifreeze to 50% water on up to 70% glycol based antifreeze to 30% water are typically recommended. However, when coolant fluid levels need to be replenished, often times a user (not shown) will add only water or only glycol based antifreeze to the radiator system. Thus, over time the ratio of glycol based antifreeze to water may not be known. 
     Other vehicular fluids such as oil, transmission fluid, and the like also have chemical properties that should preferably be kept within specified ranges. Unfortunately, existing testing methods for coolant brake fluid, and/or other vehicular fluids are typically too cumbersome in the aggregate. In many instances, multiple separate testing devices must be used to provide a complete battery of tests for a vehicle. Hence, coolant, brake fluid, and/or other vehicular fluids may only be infrequently tested. Performing a complete battery of tests may be time and/or cost prohibitive. Accordingly, many individuals continue to operate their vehicles under unsafe conditions, unaware that one or more vehicular fluids require replacement or remediation. 
     SUMMARY 
     In some embodiments, a multi-fluid test strip may include a first zone to test a first fluid, a second zone to test a second fluid, and a third zone intermediate the first zone and the second zone. The third zone may prevent cross-contamination of the first fluid with the second zone and prevent cross-contamination of the second fluid with the first zone. The multi-fluid test strip may also include a first grip zone and a second grip zone. The first zone may be intermediate the first grip zone and the third zone and the second zone may be intermediate the second grip zone and the third zone. The first grip and second grip zones may be dimensioned to permit gripping of the first and second grip zones without touching the first or second zones. 
     In other embodiments, a method of testing multiple fluids may include utilizing a multi-fluid test strip that has a first zone to test a first fluid, a second zone to test a second fluid, and a third zone intermediate the first zone and the second zone. The third zone may prevent cross-contamination of the first fluid with the second zone and prevent cross-contamination of the second fluid with the first zone. The method may also include bringing the first zone into contact with the first fluid such that the third zone avoids contamination of the second zone with the first fluid and bringing the second zone into contact with the second fluid such that the third zone avoids contamination of the first zone with the second fluid. The method may further include observing one or more metrics associated with the first fluid created by the first zone reacting with the first fluid, and observing one or more metrics associated with the second fluid created by the second zone reacting with the second fluid. 
     In yet other embodiments, a multi-fluid test strip may include a first zone to test a first fluid with a first test pad, a second zone to test a second fluid with a second and third test pad, and a third zone intermediate the first zone and the second zone. The third zone may prevent cross-contamination of the first fluid with the second zone and prevent cross-contamination of the second fluid with the first zone. In at least one embodiment, the third zone may have a length greater than about 2.5 inches. The multi-fluid test strip may also include a first grip zone and a second grip zone. The first zone may be intermediate the first grip zone and the third zone and the second zone may be intermediate the second grip zone and the third zone. The first grip and second grip zones may be dimensioned to permit gripping of the first and second grip zones without touching the first or second zones. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiments of the disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only exemplary embodiments and are, therefore, not to be considered limiting of the disclosure&#39;s scope, the exemplary embodiments of the disclosure will be described with additional specificity and detail through use of the accompanying drawings in which: 
         FIG. 1A  is a front view of a multi-fluid test strip, according to one embodiment of the present disclosure; 
         FIG. 1B  is a side view of the multi-fluid test strip of  FIG. 1A ; 
         FIG. 1C  is a back view of the multi-fluid test strip of  FIG. 1A ; 
         FIG. 2A  is a front view of a multi-fluid test strip, according to another embodiment of the present disclosure; 
         FIG. 2B  is a side view of the multi-fluid test strip of  FIG. 2A ; 
         FIG. 2C  is a back view of the multi-fluid test strip of  FIG. 2A ; 
         FIG. 3A  is a front view of a multi-fluid test strip, according to another embodiment of the present disclosure; 
         FIG. 3B  is a front view of a multi-fluid test strip, according to another embodiment of the present disclosure; 
         FIG. 4A  is a front view of a multi-fluid test strip, according to another embodiment of the present disclosure; 
         FIG. 4B  is an isometric view of a multi-fluid test strip container, according to one embodiment of the present disclosure; 
         FIG. 5A  is an isometric view of a multi-fluid test disk, according to another embodiment of the present disclosure; 
         FIG. 5B  is a top view of a holder that may be used with the multi-fluid test disk of  FIG. 5A ; 
         FIG. 6A  is a flowchart illustrating a method of utilizing a multi-fluid test strip to test multiple fluids; and 
         FIG. 6B  is a flowchart illustrating a method of bringing multiple fluids into contact with a multi-fluid test strip. 
     
    
    
     DETAILED DESCRIPTION 
     Exemplary embodiments of the present disclosure will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. It will be readily understood that the components of the present disclosure, as generally described and illustrated in the Figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following more detailed description of the embodiments of the apparatus and method, as represented in the Figures, is not intended to limit the scope of the present disclosure, as claimed in this or any other application claiming priority to this application, but is merely representative of exemplary embodiments of the present disclosure. 
     The phrases “connected to,” “coupled to,” and “in communication with” refer to any form of interaction between two or more entities, including mechanical, electrical, magnetic, electromagnetic, fluid, and thermal interaction. Two components may be functionally coupled to each other even though they are not in direct contact with each other. The term “abutting” refers to items that are in direct physical contact with each other, although the items may not necessarily be attached together. The phrase “fluid communication” refers to two features that are connected such that a fluid within one feature is able to pass into the other feature. 
     The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated. 
     Embodiments disclosed herein are generally discussed in the context of brake fluid and coolant fluid for simplicity. However, it will be understood that other fluids may also be used with the present disclosure including, but not limited to hydraulic fluids, internal combustion engine oils, non-internal combustion engine oils, transmission fluids, power steering fluids, hydraulic clutch fluids, shock/strut oils, differential fluids, and the like. 
       FIGS. 1A-1B  illustrates various view of a multi-fluid test strip  100 , according to one embodiment of the present disclosure. The multi-fluid test strip  100  may include a first zone  110 , a second zone  120 , a third zone  130 , a first grip zone  141 , a second grip zone  142 , and a substrate  160  that passes through the first zone  110 , the second zone  120 , the third zone  130 , the first grip zone  141 , and the second grip zone  142 . The first zone  110  may be configured to test a first fluid (not shown) and the second zone  120  may be configured to test a second fluid (not shown). The third zone  130  may be intermediate the first zone  110  and the second zone  120  and configured to prevent cross-contamination of the first fluid with the second zone  120  and prevent cross-contamination of the second fluid with the first zone  110 . The first zone  110  may be intermediate the first grip zone  141  and the third zone  130 . Likewise, the second zone  120  may be intermediate the second grip zone  142  and the third zone  130 . The first grip zone  141  may be dimensioned to permit gripping of the first grip zone  141  without touching the first zone  110  and, similarly, the second grip zone  142  may be dimensioned to permit gripping of the second grip zone  142  without touching the second zone  120 . For example, in some embodiments the first and/or second grip zones  141 ,  142  may have a length of about 0.3 inches to about 0.5 inches. In other embodiments, the first and/or second grip zones  141 ,  142  may have a length of about 0.5 inches to about 0.7 inches. In further embodiments the first and/or second grip zones  141 ,  142  may have a length of about 0.7 inches to about 1.0 inches. In still other embodiments the first and/or second grip zones  141 ,  142  may have a length less than about 0.3 inches. In yet further embodiments the first and/or second grip zones  141 ,  142  may have a length greater than about 1.0 inches. 
     In the embodiment shown in  FIGS. 1A-1C , the first zone  110  may include a first test pad  111  configured to test a first aspect of the first fluid. The second zone  120  may also include a second test pad  122  configured to test a second aspect of the second fluid, as well as a third test pad  123  configured to test a third aspect of the second fluid. However, it will be understood that any number of test pads may be used in either the first zone  110  or the second zone  120 . 
     The second test pad  122  and the third test pad  123  may be separated from each other by a barrier  150  and/or spaced apart from each other perpendicular to a length of the multi-fluid test strip  100 . However, in other embodiments test pads may be spaced apart from each other perpendicular to a length of the multi-fluid test strip  100 , or at any other angle relative to a length of the multi-fluid test strip  100 . The barrier  150  may generally act to prevent or reduce flow of the second fluid between the second test pad  122  and the third test pad  123  to prevent color reaction contamination. For example, if color from the second test pad  122  is able to flow to the third test pad  123  (or vice versa), then the color of the reaction(s) may be inaccurate. 
     In at least one embodiment, the barrier  150  is a cross-hatch zone formed in the multi-fluid test strip  100  that is configured to reduce or prevent fluid flow between the second test pad  122  and the third test pad  123 . In at least one embodiment, the cross-hatch zone may be a pattern formed in the multi-fluid test strip  100  by pressing the multi-fluid test strip  100  with a suitable tool (not shown) that has a cross-hatch pattern. The crosshatch zone may resist flow of the second fluid between the second test pad  122  and the third test pad  123  due to compressing of the multi-fluid test strip  100 , which acts to reduce fluid flow across the crosshatch zone by reducing capillary action forces inside the compressed material of the multi-fluid test strip  100 . Additionally, the orientation and pattern of the intersecting lines in the cross-hatch zone may also act to reduce flow of the second fluid over the surface of the multi-fluid test strip  100  because the intersecting lines may form ridges that resist fluid flow and/or may direct fluid flow in one or more directions away from the test pads. 
     In at least one embodiment, the cross-hatch zone reduces or prevents fluid flow for an amount of time that is substantially long enough to allow the reactions of each test pad to take place without appreciable risk of cross-contamination between the test pads. In other embodiments, the crosshatch pattern may be formed by applying a glue or adhesive onto the multi-fluid test strip  100  in a crosshatch pattern. The orientation of the glue pattern in the cross-hatch zone may act to reduce flow of the second fluid over the surface of the multi-fluid test strip  100  because intersecting lines in the glue pattern may form ridges that may resist and/or direct fluid in one or more directions away from the test pads. 
     In other embodiments, the barrier  150  may include a mechanical barrier (not shown) that is configured to reduce or prevent flow between the second test pad  122  and the third test pad  123 . In this embodiment, the mechanical barrier may include a nonpermeable material (or an at least semi-nonpermeable material) such that the second fluid is substantially prevented from flowing inside the nonpermeable material to cross-contaminate the test pads. Example nonpermeable materials may include, but are not limited to plastic materials, metals, rubber materials, silicone materials, and the like. The nonpermeable material may be placed between the second test pad  122  and the third test pad  123  as shown in  FIGS. 1A-1C . The nonpermeable material may also include structures, such as ridges or patterns (not shown), that may further reduce fluid flow over the surface of the mechanical barrier. 
     In some embodiments (not shown), a mechanical barrier may encircle a substrate to define a coating that serves to block motion of the liquid along the substrate, between pads. Additionally or alternatively, in some embodiments, a barrier and/or the substrate may utilize hydrophobic materials, hydrophilic materials, and/or combinations thereof to avoid and/or control the flow of liquid along the test strip. 
     In other embodiments, the barrier  150  may include a length of test strip that is sufficiently long enough to effectively reduce or prevent fluid flow between test pads for an amount of time that is sufficiently long enough to allow the reactions of each test pad to take place without appreciable risk of cross-contamination between the test pads. In this embodiment, the length of test strip between the test pads may vary depending on the characteristics of each test pad. For example, the length of test strip between the test pads may depend on the tendency of a given test pad to leech chemicals or color dyes and/or the specific sensitivity of a given adjacent test pad to the leeched chemicals or color dyes. 
     The third zone  130  may also include a length of test strip that is sufficiently long to effectively reduce or prevent fluid flow between the first zone  110  and the second zone  120 . The third zone may also include one or more barriers (not shown), such as crosshatch zones and/or one or more mechanical barriers, as discussed above. In at least one embodiment, the third zone  130  may have a length of test strip that is within the range of 0.25 inches to 1.5 inches. More specifically, the third zone  130  may have a length within the range of 0.5 inches to 1.0 inches. Yet more specifically, the third zone  130  may have a length within the range of 0.6 inches to 0.8 inches. Still more specifically, the third zone  130  may have a length of about 0.7 inches. In other embodiments, the third zone  130  may have a length of test strip that is between about 0.7 inches and about 2.5 inches. In yet further embodiments, the third zone  130  may have a length of test strip that is greater than about 2.5 inches. In such embodiments, the longer length of the third zone  130  may help facilitate the fluid testing process because longer test strips may better reach fluids that are housed deep within a container and/or reach fluids that may be hard to access because the container holding the fluid may have a small opening. 
     A gripping tool (not shown), such as a clip, an alligator clip, and the like, may also be used to grip the multi-fluid test strip  100  by one of its gripping zones to facilitate fluid testing in hard to reach places. The gripping tool may also reduce the likelihood of accidental contamination of the test pads by a user&#39;s fingers and prevent damage to the test pads by attaching the gripping tool to the grip zones of the multi-fluid test strip  100 . 
     Longer test strips may also be folded in half so they can more easily fit inside a suitable storage container, such as the multi-fluid test strip container  600  shown in  FIG. 4B . The multi-fluid test strip container  600  shown in  FIG. 4B  may include a container lid  620  and a container body  610 . The container lid  620  may be configured to have a tight seal with the container body  610  to protect the multi-fluid test strips  100  from atmospheric humidity and other environmental contaminants in order to increase the shelf life of the multi-fluid test strips  100 . The container lid  620  may also include a desiccant or molecular sieve that further helps protect the multi-fluid test strips  100  from atmospheric humidity and other environmental contaminants. 
     In at least one embodiment, the first fluid may be a brake fluid and the second fluid may be a coolant fluid. In general, both of these fluids may be tested as part of a battery of tests performed synchronously or in close succession with the multi-fluid test strip  100  shown in  FIGS. 1A-1C  (or other test strips disclosed herein) by placing at least a portion of the brake fluid on the first zone  110 , and placing at least a portion of the coolant fluid on the second zone  120 . 
     The first test pad  111  may be configured to test a first metric associated with the brake fluid by reacting with the brake fluid to produce a first color change representative of the first metric associated with the brake fluid. The first metric may represent at least one of a copper level, an iron level, a DOT fluid type, and a first pH level of the brake fluid. Likewise, the second test pad  122  and the third test pad  123  may each be configured to test a second metric and a third metric associated with the coolant fluid by reacting with the coolant fluid to produce a second color change and a third color change representative of the second metric and the third metric associated with the coolant fluid. The second metric and the third metric may represent at least one of a glycol level, a reserve alkalinity, and a second pH level of the coolant fluid. In at least one embodiment, the second test pad  122  and the third test pad  123  may be configured to produce a substantially similar second color change and a substantially similar third color change for more than one type of coolant fluid. For example, the second test pad  122  and the third test pad  123  may produce a substantially similar second color change and a substantially similar third color change regardless of whether ethylene glycol based coolant fluids or propylene glycol based coolant fluids are used during the test. In at least one embodiment, the second test pad  122  may be configured to test a pH of the coolant fluid and the third test pad  123  may be configured to test a glycol level of the coolant fluid. 
     Each of the color changes disclosed herein may be compared against one or more color scales or color charts to ascertain an aspect or metric associated with the fluid under test. The one or more color scales or color charts may be further integrated together onto a single reference guide to simplify the test process. Color scales and charts are more fully discussed in the documents incorporated herein by reference, which are listed above. 
       FIGS. 2A-2C  illustrate various views of a multi-fluid test strip  200 , according to another embodiment of the present disclosure. The multi-fluid test strip  200  may include similar features to the multi-fluid test strip  100  of  FIGS. 1A-1C , such as: a first zone  210 , a first test pad  211 , a second zone  220 , a second test pad  222 , a third test pad  223 , a third zone  230 , a first grip zone  241 , a second grip zone  242 , one or more barriers  250 , and a substrate  260 . However, the multi-fluid test strip  200  may also include additional features, such as a fourth test pad  214  that may be separated from the first test pad  211  by one or more barriers  250 . The fourth test pad  214  may be configured to measure an additional metric of a brake fluid, such as a copper level, an iron level, a DOT fluid type, and a first pH level of the brake fluid. It will be understood that any of the test strips disclosed herein may also include any number of test pads. 
       FIG. 3A  shows a front view of a multi-fluid test strip  300 , according to another embodiment of the present disclosure. The multi-fluid test strip  300  may include similar features to the multi-fluid test strip  200  of  FIGS. 2A-2C , such as: a first zone  310 , a first test pad  311 , a second zone  320 , a second test pad  322 , a third test pad  323 , a fourth test pad  314 , a third zone  330 , a first grip zone  341 , a second grip zone  342 , and one or more barriers  350 . However, the multi-fluid test strip  300  may also include additional features, such as a perforation  370  in the third zone  330  of the multi-fluid test strip  300 . The perforation  370  may allow the user to separate the first zone  310  from the second zone  320  to further reduce or eliminate the risk of cross-contamination between fluids during testing. It will be understood that any of the test strips disclosed herein may also include a suitable perforation to allow separation of the first zone from the second zone for a given test strip. 
     The perforation  370  may have any structure suitable for facilitating separation of the two ends of the multi-fluid test strip  300  from each other. The perforation  370  may be configured such that separation can easily be performed by hand. Alternatively, the perforation  370  may facilitate separation through the use of a break feature on a tool or container, such as a pair of scissors, a serrated edge of the container housing multiple multi-fluid test strips  300 , and/or the like. 
       FIG. 3B  shows a front view of a multi-fluid test strip  400 , according to another embodiment of the present disclosure. The multi-fluid test strip  400  may include similar features to the multi-fluid test strip  200  of  FIGS. 2A-2C , such as: a first zone  410 , a first test pad  411 , a second zone  420 , a second test pad  422 , a third test pad  423 , a fourth test pad  414 , a third zone  430 , a first grip zone  441 , a second grip zone  442 , and one or more barriers  450 . However, the multi-fluid test strip  400  may also include additional features, such as a fifth test pad  425 . Moreover, the one or more barriers  450  may include suitable lengths of test strip between the test pads, as shown in  FIGS. 2A-2C . It will be understood that any of the test strips disclosed herein may also include any number or style of barriers between test pads to help reduce or prevent cross-contamination between test pads. 
       FIG. 4A  shows a front view of a multi-fluid test strip  500 , according to another embodiment of the present disclosure. The multi-fluid test strip  500  may include similar features to the multi-fluid test strip  200  of  FIGS. 2A-2C , such as: a first zone  510 , a first test pad  511 , a second zone  520 , a second test pad  522 , a third test pad  523 , a fourth test pad  514 , a third zone  530 , a first grip zone  541 , a second grip zone  542 , and one or more barriers  550 . However, the multi-fluid test strip  500  may also include additional features, such as a fifth test pad  525 , a sixth test pad  526 , a seventh test pad  517 , and an eighth test pad  518 . 
     As shown in  FIG. 4A , the test pads  511 ,  514 ,  517 ,  518 ,  522 ,  523 ,  525 ,  526  may be spaced apart from each other perpendicular to a length of the multi-fluid test strip  500 . Likewise, the one or more barriers  550  may also be spaced apart from each other perpendicular to a length of the multi-fluid test strip  500 . It will be understood that any of the test strips disclosed herein may include any number of test pads arranged along a length of the test strip, spaced apart from each other perpendicular to a length of the test strip, spaced apart from each other at any angle relative to a length of the test strip, placed in a non-uniform pattern, and/or staggered in any manner to help prevent cross-contamination. Moreover, it will be understood that the length and/or width of any test strip disclosed herein may be varied to accommodate any number of test pads arranged, and/or spaced apart from each other, in any fashion. 
     It will also be understood that any of the test strips disclosed herein may be placed onto a suitable color readout chart (not shown), such as a card with a boundary in the center where a test strip may be placed. The test strip may further be secured to the color readout chart by any suitable means including, but not limited to: cuts formed in the color readout chart, adhesive, holders, etc. The test pads may be positioned near appropriate color charts corresponding to fluid metrics of interest. In at least one embodiment, a single color chart may be used for multiple fluids. In other embodiments, a series of color charts may be used for one or more fluids. 
       FIGS. 5A and 5B  illustrate a multi-fluid test disk  700  and a holder  800 , according to another embodiment of the present disclosure. The multi-fluid test disk  700  may include a substrate  760 , one or more test zones  701 , a first test pad  711 , a second test pad  722 , a third test pad  723 , and one or more barriers  750 . 
     The substrate  760  may have a generally circular shape and the one or more test zones  701  may be arranged around the substrate  760  in a circular fashion, having pie or wedge shapes. The substrate  760  may also have an aperture  780  formed in the center of the substrate  760  that is configured to receive a connector (not shown) that may couple the substrate  760  to the holder  800  which may have a corresponding holder aperture  810 . The holder  800  may also have a window  810  formed therein. The holder  800  may be rotatably coupled to the substrate  760 . The user may rotate the holder  800  relative to the substrate  760  such that the window  810  of the holder  800  may be placed over a selected test zone  701 . Once the user has selected a test zone  701 , the user may apply one or more fluids to the test pads  711 ,  722 ,  723  of the selected test zone  701  to test various aspects or metrics of the one or more fluids, as previously discussed. 
     In at least one embodiment, the user may remove at least a portion of a brake fluid from a container (not shown), such as a brake fluid reservoir on a vehicle, and place the at least a portion of a brake fluid on the first test pad  711 . The user may also remove at least a portion of a coolant fluid from a container (not shown), such as a coolant reservoir on a vehicle, and place the at least a portion of the coolant fluid on the second test pad  722  and the third test pad  723 . The user may also rotate the holder  800  such that the window  810  formed in the holder  800  reveals another test zone  701  that has not been used, and repeat this process. In this manner, the user may utilize the multi-fluid test disk  700  to perform multiple multi-fluid tests. It will be understood that in other embodiments, the number of test zones  701  may vary by any number, and the number and arrangement of test pads for each test zone may also vary by any number. In some embodiments, the holder  800  may have a color chart or other indicator (not shown) placed on the holder  800 . The color chart or other indicator may help the user evaluate the appearance of one or more test pads that are visible through the window  810  of the holder  800  via comparison of the appearance of the pad with the color chart or other indicator. 
     The test pads  711 ,  722 ,  723  of each test zone  701  may be separated from each other by barriers  750 , which may include cross-hatching, mechanical barriers, and/or suitable lengths of test strip material, similar to other embodiments previously discussed. Moreover, individual test zones  701  may also be separated from each other by barriers, which may also include cross-hatching, mechanical barriers, and/or suitable lengths of test strip material. 
     Similar to the multi-fluid test disk  700  and holder  800  of  FIGS. 5A and 5B , a multi-fluid test slider (not shown) is also envisioned, according to another embodiment of the present disclosure. The multi-fluid test slider may include similar features to the multi-fluid test disk  700 , such as a substrate. However, the substrate may have any shape (e.g., rectangular, square, circular, triangular, etc.). The substrate may also include multiple test pads that may be arranged into discrete test zones and the discrete test zones may be arranged on the substrate in any manner. The substrate may be housed in a slidable holder (not shown) with or without a window formed therein. The user may select a test zone by sliding the slidable holder relative to the substrate to reveal different discrete test zones arranged on the substrate. The user may perform fluid testing by placing fluids on the different test pads of a given test zone, similar to that discussed above. The user may slide the holder such that another test zone is revealed and repeat this process. In this manner, the user may utilize the multi-fluid test slider to perform multiple multi-fluid tests. It will be understood that at least the following characteristics of the multi-fluid test slider may vary in any manner: (1) the size and shape of the substrate; (2) the number of test zones on the substrate, and their arrangement; (3) the number, type, and arrangement of test pads in each test zone; and (4) the number, type, and arrangement of barriers between individual test pads and between individual test zones. 
       FIG. 6A  illustrates a flowchart of a method  1000  by which a multi-fluid test strip  100  may be utilized to test multiple fluids. The method  1000  may begin with a step  1002  in which a multi-fluid test strip  100  may be obtained for utilization. The multi-fluid test strip  100  may include a first zone  110 , a second zone  120 , a third zone  130 , and a substrate  160 . The first zone  110  may be configured to test a first fluid and the second zone  120  may be configured to test a second fluid. The third zone  130  may be intermediate the first zone  110  and the second zone  120  and configured to prevent cross-contamination of the first fluid with the second zone  120  and prevent cross-contamination of the second fluid with the first zone  110 . Once the multi-fluid test strip  100  has been obtained for utilization, the method  1000  may proceed to a step  1004  in which the first zone  110  of the multi-fluid test strip  100  may be brought into contact with the first fluid, such that the third zone  130  avoids contamination of the second zone  120  with the first fluid. In at least one embodiment, bringing the first zone  110  into contact with the first fluid may include removing at least a portion of the first fluid and placing the at least a portion of the first fluid on the first zone  110 . In this manner, the user may reduce the likelihood of cross-contamination by controlling the amount/placement of the first fluid. 
     Once the first zone  110  of the multi-fluid test strip  100  has been brought into contact with the first fluid, the method  1000  may proceed to a step  1006  in which the second zone  120  of the multi-fluid test strip  100  may be brought into contact with the second fluid, such that the third zone  130  avoids contamination of the first zone  110  with the second fluid. In at least one embodiment, bringing the second zone  120  into contact with the second fluid may include removing at least a portion of the second fluid and placing the at least a portion of the second fluid on the second zone  120 . The user may reduce the likelihood of cross-contamination by controlling the amount/placement of the second fluid. 
     Once the second zone  120  of the multi-fluid test strip  100  has been brought into contact with the second fluid, the method  1000  may proceed to a step  1008  in which one or more metrics associated with the first fluid may be observed by the user. The one or more metrics associated with the first fluid may be created by the first zone  110  reacting with the first fluid to produce one or more color changes or other changes in appearance, depending on the type of testing associate with the first zone  110 . 
     Once the one or more metrics associated with the first fluid have been observed, the method  1000  may proceed to a step  1010  in which one or more metrics associated with the second fluid may be observed by the user. The one or more metrics associated with the second fluid may be created by the second zone  120  reacting with the second fluid to produce one or more color changes or other changes in appearance, depending on the type of testing associate with the second zone  120 . 
       FIG. 6B  illustrates a flowchart of a method  1050  by which multiple fluids may be brought into contact with a multi-fluid test strip  100 . The method  1050  may begin with a step  1052  in which a multi-fluid test strip  100  may be obtained for utilization. The multi-fluid test strip  100  may be similar to that discussed above with reference to method  1000  and may further include a first grip zone  141  and a second grip zone  142 . The first zone  110  may be intermediate the first grip zone  141  and the third zone  130 . Likewise, the second zone  120  may be intermediate the second grip zone  142  and the third zone  130 . The first grip zone  141  may be dimensioned to permit gripping of the first grip zone  141  without touching the first zone  110  and, similarly, the second grip zone  142  may be dimensioned to permit gripping of the second grip zone  142  without touching the second zone  120 . 
     Once the multi-fluid test strip  100  has been obtained for utilization, the method  1050  may proceed to a step  1052  in which the multi-fluid test strip  100  may be gripped by the first grip zone  141  and the second zone  120  of the multi-fluid test strip  100  may be dipped into the second fluid. In one embodiment, the user may use his/her fingers to grip the first grip zone  141 . In another embodiment, the user may use a gripping tool, such as an alligator clip, to grip the first grip zone  141  by coupling the multi-fluid test strip  100  to the gripping tool. 
     Once the second zone  120  of the multi-fluid test strip  100  has been dipped into the second fluid, the method  1050  may proceed to a step  1056  in which the multi-fluid test strip  100  may be gripped by the second grip zone  142  and the first zone  110  of the multi-fluid test strip  100  may be dipped into the first fluid. In one embodiment, the user may use his/her fingers to grip the second grip zone  142 . In another embodiment, the user may use a gripping tool, such as an alligator clip, to grip the second grip zone  142  by coupling the multi-fluid test strip  100  to the gripping tool. 
     Any methods disclosed herein comprise one or more steps or actions for performing the described method. The method steps and/or actions may be interchanged with one another. In other words, unless a specific order of steps or actions is required for proper operation of the embodiment, the order and/or use of specific steps and/or actions may be modified. 
     Reference throughout this specification to “an embodiment” or “the embodiment” means that a particular feature, structure or characteristic described in connection with that embodiment is included in at least one embodiment. Thus, the quoted phrases, or variations thereof, as recited throughout this specification are not necessarily all referring to the same embodiment. 
     Similarly, it will be appreciated that in the above description of embodiments, various features are sometimes grouped together in a single embodiment, figure, or description for the purpose of streamlining the disclosure. This method of disclosure, however, is not to be interpreted as reflecting an intention that any claim in this or any application claiming priority to this application require more features than those expressly recited in that claim. Rather, as the following claims reflect, inventive aspects lie in a combination of fewer than all features of any single foregoing disclosed embodiment. Thus, the claims following this Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment. This disclosure includes all permutations of the independent claims with their dependent claims. 
     Recitation in the claims of the term “first” with respect to a feature or element does not necessarily imply the existence of a second or additional such feature or element. Only elements recited in means-plus-function format are intended to be construed in accordance with 35 U.S.C. § 112 Para. 6. It will be apparent to those having skill in the art that changes may be made to the details of the above-described embodiments without departing from the underlying principles of the disclosure. 
     While specific embodiments and applications of the present disclosure have been illustrated and described, it is to be understood that the disclosure is not limited to the precise configuration and components disclosed herein. Various modifications, changes, and variations which will be apparent to those skilled in the art may be made in the arrangement, operation, and details of the methods and systems of the present disclosure herein without departing from the spirit and scope of the disclosure.