Oakton EW-35632-32

Optical DO sensor eliminates costly, tiresome membranes and solutions  Durable waterproof and dustproof design with IP67 rating  Barometric pressure and salinity correction  Memory for up to 500 data sets with USB or RS-232 output to PC  Built-in stand allows for easy benchtop use  500 hours battery life, or optional universal power adapter Display type Backlit LCD Min pH (pH) -2 Max pH (pH) 16 pH Resolution 0.01 pH Accuracy ±0.01 Buffer Recognition DIN, NIST, USA, and custom Calibration Up to 6 points Min mV (mV) -2000 Max mV (mV) 2000 mV Resolution 0.01 mV mV Accuracy ±0.5% FS Min Dissolved Oxygen 0 to 20 ppm, 0 to 200% Dissolved Oxygen Resolution 0.1 ppm, 0.1% saturation Dissolved Oxygen Accuracy ±2% Min Temperature (° C) -10 Max Temperature (° C) 110 Min Temperature (° F) 14 Max Temperature (° F) 230 Interface RS-232 and USB Waterproof Yes Battery 2 x AA batteries (included) Battery life (hr) 500 Width (cm) 7.9375 Height (cm) 6.35 Width (in) 3 1/8 Height (in) 2 1/2 > Each Unit Includes PD 450 meter Two AA batteries.