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