Patent ID: 7919324

Claim:
An integrated, multi-test, immersable test strip-type liquid testing device for determining the value of at least one property of a liquid to be tested, the liquid testing device comprising: a test substrate; and at least one test section, located on said test substrate, including: a test sub-section which exhibits a reaction color according to said value, as a result of reaction of a reagent with said liquid, said reagent being impregnated within said test sub-section prior to testing; and a reference section located adjacent to said test sub-section, said reference section including a plurality of different reference colors and being arranged such that each of said plurality of reference colors is situated adjacent to and in contact with said test sub-section, wherein said test sub-section substantially encompasses said entire reference section having said plurality of different reference colors, such that, when said test sub-section exhibits said reaction color in accordance with a liquid property value, said value is indicated by a matching one of said reference colors which lies against said test sub-section reaction color, so as to become substantially visually merged therewith, said device enabling liquid analysis of the test liquid by a self-contained, one-step procedure of immersion of the entire strip including both said test sub-section and said reference section, reaction during immersion and color reading of said reaction results upon retrieval from the test liquid, wherein reading of said indicated value in said test sub-section is performed by visually matching said test sub-section reaction color with said substantially visually merged one of said different reference colors due to self-alignment therebetween, such that said indicated value of said at least one property of a liquid can be simply read in a straight forward matching process with improved accuracy in and immediate fashion, without requiring the physical alignment of said test sub-section reaction color with said reference colors.