??? ????? ??????? ?????? – The handheld TDS meter digital water tester allows you to accurately measure the Total Dissolved Solids in water. Ideal for portability, you can carry this TDS tester conveniently. ????? ??? ??????? ????? ??????? – Test the water quality from multiple sources. Use this TDS meter for RO/RODI system drinking water, aquariums, hydroponics, and more. ???????? ?????? ???????? ???????? – This TDS water quality tester provides highly accurate readings. Its hold function saves measurement for convenient readings and recording. ???? ?? ??? & ??? ??? ?? ?????? ?? ? ?????? - pH paper is giving you a quick way to estimate the pH of a solution without any expensive equipment or pre-calibration, even for somebody with little or even no chemistry background can get the results immediately. ????-????? ?? ????? ??? ??????? ???????????? - Provides accurate pH measurement at each full(1.00) pH unit, allows the user to measure the entire pH range from pH 1.0-14.0, you could test the pH for almost all liquids around you, as well as solids or gaseous molecules for users with professional background. › See more product details