A compact and precise instrument for measuring water quality, ideal for aquariums, reverse osmosis systems, fertilization systems, and home use. The tester measures electrical conductivity (EC, in µS) and total dissolved solids (TDS, in ppm), allowing for accurate monitoring of water purity. Equipped with ATC (automatic temperature compensation), it ensures reliable readings under all conditions. The digital display allows for simple and immediate readings. An indispensable tool for anyone who wants to accurately monitor the water in their aquarium or reverse osmosis system.