Star A215 pH/Conductivity BT Meter pH Range 0 to 600 Percent to Dissolved Oxygen Waterproof IP67 Automatic Temperature Compensation Yes Displayed Temperature Range 0 to 120 Operating Temp Range (F) 0 Degrees to 120 Degrees Display High Resolution Mono-chromatic Auto Power Off Yes Calibration 5 point Cable Length 3 m Power Source AC or (4) AA Battery Includes Star A215 pH/Conductivity BT Meter with Electrode Stand Manufacturers Warranty Length 36 mo