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The 9-in-1 DO700 kit measures DO concentration/saturation, pH, mV, temperature, conductivity, TDS, salt content and resistance. It features automatic salt content compensation and manual air pressure compensation for DO measurements. In addition, it has an automatic one-button calibration of 4, 7 and 10 pH with a choice of three-point calibrations for better accuracy and provides automatic temperature compensation. Complete with DO probe, pH/mV/Temp electrode, polymer conductivity cell, pH and conductivity calibration solutions, batteries and hard shell case.This text is machine translated.