Pocket TDS Meter, TDS Range 10 to 9990 ppm, TDS Accuracy +/-1 Percent F.S., TDS Resolution 10 ppm, Testing Parameter Total Dissolved Solids (TDS), Power Source 9V Battery, Number of Tests 1, Operating Temp. Range (C) 0 Degrees to 50 Degrees, Operating Temp. Range (F) 32 Degrees to 122 Degrees, Display LCD, Calibration 1 Point (940 ppm), Automatic Temp. Compensation Yes, Auto Power Off No, Includes Calibration Solution, Calibration Screwdriver, Battery, Hard Carrying Case, Instructions