Extech DO700 Portable Dissolved Oxygen MeterExtech DO700 Portable Dissolved Oxygen Meter Portable Dissolved Oxygen Meter 9 in 1 Meter with Lab Performance Dissolved Oxygen concentration saturation, pH, mV, Conductivity, TDS, Salinity, Resistivity and Temperature Key Features: Automatic salinity compensation and manual barometric pressure compensation for DO measurements Waterproof housing (meets IP57) One button pH calibration (4, 7, and 10pH) Choice of 3 point pH calibration for better
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