Conductivity Meter, Electric Conductivity Range 0 to 499.9 uS/cm, TDS Range 0.30 to 1.00g/L, Default Value 0.65, Waterproof IP67, Automatic Temperature Compensation No, Displayed Temperature Range -10 Degrees to 90 Degrees C, Salinity Range 0 to 70 ppt, Operating Temp. Range (F) 32 Degrees to 122 Degrees , Operating Temp. Range (C) 0 Degrees to 50 Degrees , Display Digital, Auto Power Off Yes, Memory 50 Data Sets, Calibration Yes, Interface None, Cable Length 1 m, Power Source 9V Battery