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Apera Instruments, LLC-AI314 Premium Series EC60 Waterproof Conductivity Pocket Tester Kit, ±1% F.S Accuracy, Easy Switch of EC/TDS/Salinity, Replaceable Probe sold2025 2" is great convienent forApera Instruments, LLC AI314 Premium Series EC60 Waterproof Conductivity Pocket Tester Kit, 1% F. S Accuracy, Easy Switch of EC TDS Salinity, Replaceable Probe Apera Instruments Premium Series EC60 Pocket Tester tests conductivity TDS salinity of general water solutions in a reliable and easy manner. The applications include hydroponics, tap drinking water, pools& spas, education, water treatment, environmental monitoring, etc. Up to 3 points of auto.