Weighing scale - wikipedia Weighing scale The examples and perspective in this article may not represent a worldwide view of the subject. You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate. ( October 2017 ) Digital kitchen scale, a strain gauge scale For other uses, see Scale ( disambiguation ). Weighing scales ( or weigh scales or scales ) are devices to measure mass. Spring balances or spring scales calculate mass by first measuring weight by balancing the force due to gravity against the force on a spring, whereas a balance or pair of scales using a balance beam compares masses by balancing the weight due to the mass of an object against the weight of one or more known masses. Some of them can be calibrated to read in units of force ( weight ) such as newtons instead of units of mass such as kilograms. The balance or pair of scales using a traditional balance beam to compare masses may read correctly for mass even if moved to a place with a different non-zero gravitational field strength. Also the spring balances that are designed with reading of weight ( force ) in mind, would read correctly for weight in a different non-zero gravitational field strength. Scales and balances are widely used in commerce, as many products are sold and packaged by mass. Very accurate balances, called analytical balances, are used in scientific fields such as chemistry. Contents 1 Force - measuring ( weight ) scales 1.1 History 1.2 Mechanical scales 1.2. 1 Spring scales 1.2. 2 Hydraulic or pneumatic scale 1.3 Digital scales 1.3. 1 Digital bathroom scale 1.3. 2 Strain gauge scale 1.3. 3 Supermarket and other retail scale 1.4 Testing and certification 1.4. 1 Sources of error 2 Balance scales 2.1 Mechanical balances 2.1. 1 Roberval balance 2.2 Electronic devices 2.2. 1 Microbalance 2.2. 2 Analytical balance 2.2. 3 Pendulum balance scales 2.3 Symbolism 2.4 History of the balance scale 3 Hybrid spring and balance scales 3.1 Elastic arm scale 4 See also 5 References 6 External links Force - measuring ( weight ) scales History A Simple balance from the 19th century Although records dating to the 1700s refer to spring scales for measuring mass, the earliest design for such a device dates to 1770 and credits Richard Salter, an early scale - maker. Spring scales came into wide usage in the United Kingdom after 1840 when R.W. Winfield developed the candlestick scale for weighing letters and packages, required after the introduction of the Uniform Penny Post. Postal workers could work more quickly with spring scales than balance scales because they could be read instantaneously and did not have to be carefully balanced with each measurement. By the 1940s various electronic devices were being attached to these designs to make readings more accurate. Load cells, small nodes that convert pressure ( or force ) to a digital signal, have their beginnings as early as the late nineteenth century, but it was not until the late twentieth century that they became accurate enough for widespread usage. Mechanical scales A mechanical scale or balance is used to describe a weighing device that is used to measure the mass, force exertion, tension and resistance of an object without the need of a power supply. Types of mechanical scale include spring scales, hanging scales, triple beam balances and force gauges. Spring scales This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. ( September 2015 ) Main article : Spring scale A spring scale measures mass by reporting the distance that a spring deflects under a load. This contrasts to a balance, which compares the torque on the arm due to a sample weight to the torque on the arm due to a standard reference mass using a horizontal lever. Spring scales measure force, which is the tension force of constraint acting on an object, opposing the local force of gravity. They are usually calibrated so that measured force translates to mass at earth 's gravity. The object to be weighed can be simply hung from the spring or set on a pivot and bearing platform. In a spring scale, the spring either stretches ( as in a hanging scale in the produce department of a grocery store ) or compresses ( as in a simple bathroom scale ). By Hooke 's law, every spring has a proportionality constant that relates how hard it is pulled to how far it stretches. Weighing scales use a spring with a known spring constant ( see Hooke 's law ) and measure the displacement of the spring by any variety of mechanisms to produce an estimate of the gravitational force applied by the object. Rack and pinion mechanisms are often used to convert the linear spring motion to a dial reading. Spring scales have two sources of error that balances do not : the measured mass varies with the strength of the local gravitational force ( by as much as 0.5 % at different locations on Earth ), and the elasticity of the measurement spring can vary slightly with temperature. With proper manufacturing and setup, however, spring scales can be rated as legal for commerce. To remove the temperature error, a commerce - legal spring scale must either have temperature - compensated springs or be used at a fairly constant temperature. To eliminate the effect of gravity variations, a commerce - legal spring scale must be calibrated where it is used. Hydraulic or pneumatic scale It is also common in high - capacity applications such as crane scales to use hydraulic force to sense mass. The test force is applied to a piston or diaphragm and transmitted through hydraulic lines to a dial indicator based on a Bourdon tube or electronic sensor. Digital scales Digital bathroom scale A digital bathroom scale is a type of electronic weighing machine, which is used to measure many readings including body fat, BMI, lean mass, muscle mass, water ratio along with body mass. The digital bathroom scale is a smart scale which has many functions like smartphone integration, cloud storage, fitness tracking, etc. Strain gauge scale In electronic versions of spring scales, the deflection of a beam supporting the unknown mass is measured using a strain gauge, which is a length - sensitive electrical resistance. The capacity of such devices is only limited by the resistance of the beam to deflection. The results from several supporting locations may be added electronically, so this technique is suitable for determining the mass of very heavy objects, such as trucks and rail cars, and is used in a modern weighbridge. Supermarket and other retail scale These scales are used in the modern bakery, grocery, delicatessen, seafood, meat, produce and other perishable goods departments. Supermarket scales can print labels and receipts, mark mass and count, unit price, total price and in some cases tare. Some modern supermarket scales print an RFID tag that can be used to track the item for tampering or returns. In most cases, these types of scales have a sealed calibration so that the reading on the display is correct and can not be tampered with. In the USA, the scales are certified by the National Type Evaluation Program ( NTEP ), in South Africa by the South African Bureau of Standards and in the UK by the International Organization of Legal Metrolog. Testing and certification See also : Verification and validation Scales used for trade purposes in the state of Florida, as this scale at the checkout in a cafeteria, are inspected for accuracy by the FDACS 's Bureau of Weights and Measures. Most countries regulate the design and servicing of scales used for commerce. This has tended to cause scale technology to lag behind other technologies because expensive regulatory hurdles are involved in introducing new designs. Nevertheless, there has been a trend to `` digital load cells '' which are actually strain - gauge cells with dedicated analog converters and networking built into the cell itself. Such designs have reduced the service problems inherent with combining and transmitting a number of 20 millivolt signals in hostile environments. Government regulation generally requires periodic inspections by licensed technicians, using masses whose calibration is traceable to an approved laboratory. Scales intended for non-trade use, such as those used in bathrooms, doctor 's offices, kitchens ( portion control ), and price estimation ( but not official price determination ) may be produced, but must by law be labelled `` Not Legal for Trade '' to ensure that they are not re-purposed in a way that jeopardizes commercial interest. In the United States, the document describing how scales must be designed, installed, and used for commercial purposes is NIST Handbook 44. Legal For Trade ( LFT ) certification usually approve the readability as repeatability / 10 to ensure a maximum margin of error of 10 %. Because gravity varies by over 0.5 % over the surface of the earth, the distinction between force due to gravity and mass is relevant for accurate calibration of scales for commercial purposes. Usually the goal is to measure the mass of the sample rather than its force due to gravity at that particular location. Traditional mechanical balance - beam scales intrinsically measured mass. But ordinary electronic scales intrinsically measure the gravitational force between the sample and the earth, i.e. the weight of the sample, which varies with location. So such a scale has to be re-calibrated after installation, for that specific location, in order to obtain an accurate indication of mass. Sources of error Some of the sources of error in weighing are : Buoyancy -- Objects in air develop a buoyancy force that is directly proportional to the volume of air displaced. The difference in density of air due to barometric pressure and temperature creates errors. Error in mass of reference weight Air gusts, even small ones, which push the scale up or down Friction in the moving components that causes the scale to reach equilibrium at a different configuration than a frictionless equilibrium should occur. Settling airborne dust contributing to the weight Mis - calibration over time, due to drift in the circuit 's accuracy, or temperature change Mis - aligned mechanical components due to thermal expansion or contraction of components Magnetic fields acting on ferrous components Forces from electrostatic fields, for example, from feet shuffled on carpets on a dry day Chemical reactivity between air and the substance being weighed ( or the balance itself, in the form of corrosion ) Condensation of atmospheric water on cold items Evaporation of water from wet items Convection of air from hot or cold items Gravitational differences for a scale which measures force, but not for a balance. Vibration and seismic disturbances Balance scales Finely crafted Pan Balance or scales with boxed set of standardized gram masses. The original form of a balance consisted of a beam with a fulcrum at its center. For highest accuracy, the fulcrum would consist of a sharp V - shaped pivot seated in a shallower V - shaped bearing. To determine the mass of the object, a combination of reference masses was hung on one end of the beam while the object of unknown mass was hung on the other end ( see balance and steelyard balance ). For high precision work, such as empirical chemistry, the center beam balance is still one of the most accurate technologies available, and is commonly used for calibrating test masses. Mechanical balances The balance ( also balance scale, beam balance and laboratory balance ) was the first mass measuring instrument invented. In its traditional form, it consists of a pivoted horizontal lever with arms of equal length -- the beam -- and a weighing pan suspended from each arm ( hence the plural name `` scales '' for a weighing instrument ). The unknown mass is placed in one pan and standard masses are added to the other pan until the beam is as close to equilibrium as possible. In precision balances, a more accurate determination of the mass is given by the position of a sliding mass moved along a graduated scale. Technically, a balance compares weight rather than mass, but, in a given gravitational field ( such as Earth 's gravity ), the weight of an object is proportional to its mass, so the standard masses used with balances are usually labeled in units of mass ( e.g. g or kg ). Two 10 - decagram masses Market hawker weighing meat ( in Kati ) on a beam balance. Masses of 50, 20, 1, 2, 5 and 10 grams Unlike spring - based scales, balances are used for the precision measurement of mass as their accuracy is not affected by variations in the local gravitational field. ( On Earth, for example, these can amount to ± 0.5 % between locations. ) A change in the strength of the gravitational field caused by moving the balance does not change the measured mass, because the moments of force on either side of the beam are affected equally. A balance will render an accurate measurement of mass at any location experiencing a constant gravity or acceleration. Very precise measurements are achieved by ensuring that the balance 's fulcrum is essentially friction - free ( a knife edge is the traditional solution ), by attaching a pointer to the beam which amplifies any deviation from a balance position ; and finally by using the lever principle, which allows fractional masses to be applied by movement of a small mass along the measuring arm of the beam, as described above. For greatest accuracy, there needs to be an allowance for the buoyancy in air, whose effect depends on the densities of the masses involved. Aluminum, mass - produced balance scale ( steelyard balance ) sold and used throughout China : the scale can be inverted and held by the larger ring beneath the user 's right hand to produce greater leverage for heavier loads ( Hainan Province, China ) To reduce the need for large reference masses, an off - center beam can be used. A balance with an off - center beam can be almost as accurate as a scale with a center beam, but the off - center beam requires special reference masses and can not be intrinsically checked for accuracy by simply swapping the contents of the pans as a center - beam balance can. To reduce the need for small graduated reference masses, a sliding weight called a poise can be installed so that it can be positioned along a calibrated scale. A poise adds further intricacies to the calibration procedure, since the exact mass of the poise must be adjusted to the exact lever ratio of the beam. For greater convenience in placing large and awkward loads, a platform can be floated on a cantilever beam system which brings the proportional force to a noseiron bearing ; this pulls on a stilyard rod to transmit the reduced force to a conveniently sized beam. One still sees this design in portable beam balances of 500 kg capacity which are commonly used in harsh environments without electricity, as well as in the lighter duty mechanical bathroom scale ( which actually uses a spring scale, internally ). The additional pivots and bearings all reduce the accuracy and complicate calibration ; the float system must be corrected for corner errors before the span is corrected by adjusting the balance beam and poise. A Roberval balance. The pivots of the parallelogram understructure makes it insensitive to load positioning away from center, so improves its accuracy, and ease of use. Roberval balance Main article : Roberval balance In 1669 the Frenchman Gilles Personne de Roberval presented a new kind of balance scale to the French Academy of Sciences. This scale consisted of a pair of vertical columns separated by a pair of equal - length arms and pivoting in the center of each arm from a central vertical column, creating a parallelogram. From the side of each vertical column a peg extended. To the amazement of observers, no matter where Roberval hung two equal weight along the peg, the scale still balanced. In this sense, the scale was revolutionary : it evolved into the more - commonly encountered form consisting of two pans placed on vertical column located above the fulcrum and the parallelogram below them. The advantage of the Roberval design is that no matter where equal weights are placed in the pans, the scale will still balance. A gear balance : A = Axle, F = Frame, G = Generator, GL = geared linkage, WL = weighted lever ; counter weight added for balance, all the gear linkages free running on the rotating frame Further developments have included a `` gear balance '' in which the parallelogram is replaced by any odd number of interlocking gears greater than one, with alternating gears of the same size and with the central gear fixed to a stand and the outside gears fixed to pans, as well as the `` sprocket gear balance '' consisting of a bicycle - type chain looped around an odd number of sprockets with the central one fixed and the outermost two free to pivot and attached to a pan. Because it has more moving joints which add friction, the Roberval balance is consistently less accurate than the traditional beam balance, but for many purposes this is compensated for by its usability. Electronic devices Microbalance Main article : Microbalance A microbalance is an instrument capable of making precise measurements of mass of objects of relatively small mass : of the order of a million parts of a gram. Analytical balance Main article : Analytical balance Mettler digital analytical balance with 0.1 mg readability An analytical balance is a class of balance designed to measure small mass in the sub-milligram range. The measuring pan of an analytical balance ( 0.1 mg or better ) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance 's operation. This enclosure is often called a draft shield. The use of a mechanically vented balance safety enclosure, which has uniquely designed acrylic airfoils, allows a smooth turbulence - free airflow that prevents balance fluctuation and the measure of mass down to 1 μg without fluctuations or loss of product. Also, the sample must be at room temperature to prevent natural convection from forming air currents inside the enclosure from causing an error in reading. Single - pan mechanical substitution balance maintains consistent response throughout the useful capacity is achieved by maintaining a constant load on the balance beam, thus the fulcrum, by subtracting mass on the same side of the beam to which the sample is added. Electronic analytical scales measure the force needed to counter the mass being measured rather than using actual masses. As such they must have calibration adjustments made to compensate for gravitational differences. They use an electromagnet to generate a force to counter the sample being measured and outputs the result by measuring the force needed to achieve balance. Such measurement device is called electromagnetic force restoration sensor. Pendulum balance scales Pendulum type scales do not use springs. This design uses pendulums and operates as a balance and is unaffected by differences in gravity. An example of application of this design are scales made by the Toledo Scale Company. Symbolism The Ancient Egyptian Book of the Dead depicts a scene in which a scribe 's heart is weighed against the feather of truth. The scales ( specifically, a two - pan, beam balance ) are one of the traditional symbols of justice, as wielded by statues of Lady Justice. This corresponds to the use in metaphor of matters being `` held in the balance ''. It has its origins in ancient Egypt. Scales are also the symbol for the astrological sign Libra. History of the balance scale The balance scale is such a simple device that its usage likely far predates the evidence. What has allowed archaeologists to link artifacts to weighing scales are the stones for determining absolute mass. The balance scale itself was probably used to determine relative mass long before absolute mass. The oldest evidence for the existence of weighing scales dates to c. 2400 -- 1800 B.C. in the Indus River valley ( modern - day Pakistan ). Prior to that, no banking was performed due to lack of scales. Uniform, polished stone cubes discovered in early settlements were probably used as mass - setting stones in balance scales. Although the cubes bear no markings, their masses are multiples of a common denominator. The cubes are made of many different kinds of stones with varying densities. Clearly their mass, not their size or other characteristics, was a factor in sculpting these cubes. In Egypt, scales can be traced to around 1878 B.C., but their usage probably extends much earlier. Carved stones bearing marks denoting mass and the Egyptian hieroglyphic symbol for gold have been discovered, which suggests that Egyptian merchants had been using an established system of mass measurement to catalog gold shipments or gold mine yields. Although no actual scales from this era have survived, many sets of weighing stones as well as murals depicting the use of balance scales suggest widespread usage. In China, the earliest weighing balance excavated was from a tomb of the State of Chu of the Chinese Warring States Period dating back to the 3rd to 4th century BC in Mount Zuojiagong near Changsha, Hunan. The balance was made of wood and used bronze masses. Variations on the balance scale, including devices like the cheap and inaccurate bismar ( unequal - armed scales ), began to see common usage by c. 400 B.C. by many small merchants and their customers. A plethora of scale varieties each boasting advantages and improvements over one another appear throughout recorded history, with such great inventors as Leonardo da Vinci lending a personal hand in their development. Even with all the advances in weighing scale design and development, all scales until the seventeenth century AD were variations on the balance scale. Weighing dishes from the island of Thera, Minoan civilization, 2000 -- 1500 BC Assyrian lion weights ( 8th century BC ) in the British Museum Emperor Jahangir ( reigned 1605 -- 1627 ) weighing his son Shah Jahan on a weighing scale by artist Manohar ( AD 1615, Mughal dynasty, India ). Hybrid spring and balance scales Elastic arm scale The prototype of an elastic arm scale measuring a mass. In 2014 a concept of hybrid scale has been introduced, the elastically deformable arm scale, which is a combination between a spring scale and a beam balance, exploiting simultaneously both principles of equilibrium and deformation. In this scale, the rigid arms of a classical beam balance ( for example a steelyard ) are replaced with a flexible elastic rod in an inclined frictionless sliding sleeve. The rod can reach a unique free of sliding equilibrium when two vertical dead loads ( or masses ) are applied at its edges. Equilibrium, which would be impossible with rigid arms, is guaranteed because configurational forces develop at the two edges of the sleeve as a consequence of both the free sliding condition and the nonlinear kinematics of the elastic rod. This mass measuring device can also work without a counterweight. See also Ampere balance Apparent weight Auncel AutoAnalyzer Combination weigher Digital spoon scale Evans balance Faraday balance Gouy balance Kibble balance, also known as a Watt balance Mass versus weight Multihead weigher Nutrition scale Roberval balance Steelyard balance Tare weight Truck scale Weigh house - historic public building for the weighing of goods Weigh lock - for weighing canal barges References ^ Jump up to : Petruso, Karl M ( 1981 ). `` '' Early Weights and Weighing in Egypt and the Indus Valley ``, M Bulletin ''. Boston Museum of Fine Arts. pp. 44 -- 51. JSTOR 4171634. ( Subscription required ( help ) ). Missing or empty url = ( help ) Jump up ^ Brass, Brian ( 2006 ). `` '' Candlesticks, Part 1 ``, Equilibrium, No. 1 '' ( PDF ). Isasc.org. pp. 3099 -- 3109. Retrieved 2014 - 02 - 26. ^ Jump up to : `` The History of Weighing ''. Averyweigh-tronix.com. 2012 - 03 - 02. Archived from the original on March 2, 2012. Retrieved 2014 - 03 - 05. Jump up ^ `` Load Cells ''. Omega.com. Retrieved 2014 - 02 - 26. Jump up ^ `` A Guide to Choosing the Best Mechanical Scale ''. Inscale Scales ? >. Retrieved 2017 - 12 - 06. Jump up ^ `` A Guide to Choosing the Best Mechanical Scale - Inscale ''. Inscale Scales. Retrieved 2017 - 12 - 06. Jump up ^ `` What is Hooke 's Law ? ''. Retrieved 2017 - 12 - 06. Jump up ^ `` A brief history of weights and measures '' ( PDF ). California Department of Food and Agriculture Division of Measurement Standards. Jump up ^ `` Best Bathroom Scale ''. Jump up ^ `` Aflak Electronics Weighing Scale ''. Retrieved 11 November 2014. Jump up ^ `` Applying air buoyancy corrections '' ( PDF ). Andrew.ucsd.edu. September 29, 1997. Archived from the original ( PDF ) on September 7, 2006. Retrieved 2014 - 03 - 05. Jump up ^ `` Practical Uncertainty Limits to the Mass Determination of a Piston - Gage Weight '' ( PDF ). Nist.gov. Retrieved 2014 - 02 - 26. ^ Jump up to : `` Download -- A Short History to Weighing : AWTX Museum Book ''. Averyweigh-tronix.com. Archived from the original on March 2, 2012. Retrieved 2015 - 03 - 05. Jump up ^ Or `` scale '', `` scalepan '' or the obsolete `` basin '' ( A Practical Dictionary of the English and German Languages ( 1869 ), p. 1069 ). Jump up ^ Hodgeman, Charles, Ed. ( 1961 ). Handbook of Chemistry and Physics, 44th Ed. Cleveland, USA : Chemical Rubber Publishing Co. pp. 3480 -- 3485. Jump up ^ `` A&D training material '' ( PDF ). Sandd.jp. Retrieved 2014 - 02 - 26. Jump up ^ `` Sensors Mag ''. Archives.sensorsmag.com. Retrieved 2014 - 02 - 26. Jump up ^ `` Finding Aid : The Toledo Scale Collection '' ( PDF ). Utoledo.edu. Retrieved 2014 - 02 - 26. Jump up ^ Rossi, Cesare ; Russo, Flavio ; Russo, Ferruccio ( 2009 ). Ancient Engineers ' Inventions : Precursors of the Present ( History of Mechanism and Machine Science ) ( published May 11, 2009 ). p. 21. ISBN 978 - 9048122523. Jump up ^ Yan, Hong - Sen ( 2007 ). Reconstruction Designs of Lost Ancient Chinese Machinery. Springer ( published November 18, 2007 ). p. 53 - 54. Jump up ^ `` ISASC ''. ISASC. Retrieved 2014 - 02 - 26. Jump up ^ F. Bosi, D. Misseroni, F. Dal Corso and D. Bigoni, An Elastica Arm Scale. Proceedings of the Royal Society A, 470, 20140232. External links Wikimedia Commons has media related to Weighing scales. Wikisource has the text of the 1911 Encyclopædia Britannica article Balance. National Conference on Weights and Measures, NIST Handbook 44, Specifications, Tolerances, And Other Technical Requirements for Weighing and Measuring Devices, 2003 Analytical Balance article at ChemLab `` The Precious Necklace Regarding Weigh Scales '' is an 18th - century manuscript by Abd al - Rahman al - Jabarti about the `` design and operation '' of scales The history of weighing scale, The balance, Romans, Da vinci y roberval Measuring and alignment tools architect 's scale beam compass calipers chalk box combination square compass coordinate - measuring machine Diagonal scale drafting machine engineer 's scale flat spline French curve Gunter 's chain jig laser level laser line level laser measuring tool lesbian rule measuring rod micrometer plumb - bob protractor Radius gauge ruler set square sliding T bevel speed square spirit level steel square stencil straightedge T - square tape measure theodolite Thread pitch gauge try square Vernier scale vise weighing scale winding sticks yardstick Types of tools Cleaning Cutting and abrasive Forestry Garden Hand Machine and metalworking Measuring and alignment Power Retrieved from `` https://en.wikipedia.org/w/index.php?title=Weighing_scale&oldid=816308559 '' Categories : Ancient Egyptian technology Chinese inventions French inventions Italian inventions Professional symbols Weighing instruments Hidden categories : Pages containing links to subscription - only content Pages using web citations with no URL Articles with limited geographic scope from October 2017 Articles needing additional references from September 2015 All articles needing additional references All articles with vague or ambiguous time Vague or ambiguous time from September 2015 All articles with unsourced statements Articles with unsourced statements from May 2010 Wikipedia articles needing clarification from August 2014 Articles with unsourced statements from August 2014 Articles with unsourced statements from November 2012 Articles with unsourced statements from September 2008 Talk Contents About Wikipedia Alemannisch Aymar aru Azərbaycanca Български Català Чӑвашла Čeština ChiShona Dansk Deutsch Ελληνικά Español Esperanto Euskara فارسی Français Gàidhlig 한국어 Հայերեն हिन्दी Hrvatski Ido Bahasa Indonesia Italiano עברית Basa Jawa ಕನ್ನಡ ქართული Қазақша Kiswahili Коми Latviešu Lëtzebuergesch Lietuvių Lumbaart Magyar Македонски മലയാളം მარგალური Bahasa Melayu Nederlands नेपाली नेपाल भाषा 日本 語 Нохчийн Norsk Norsk nynorsk ଓଡ଼ିଆ Polski Português Ripoarisch Română Runa Simi Русский संस्कृतम् Seeltersk Shqip Sicilianu Simple English Slovenčina Српски / srpski Srpskohrvatski / српскохрватски Basa Sunda Suomi Svenska தமிழ் తెలుగు Тоҷикӣ Türkçe Українська Tiếng Việt Winaray 中文 Edit links This page was last edited on 20 December 2017, at 15 : 09. 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Question: which instrument is used to measure the weight of the body
Answer: digital bathroom scale