Waterproof and designed to float, Automatic Temperature Compensation, Automatic calibration, Tactile grip casings, HOLD function, Automatic shut-off, Efficient two button operation, Temperature in C or F, BEPS (Battery Error Prevention System), Battery % displayed at startup, The pHep5 tester is for users that require the greatest accuracy and features while staying economical, This model has BEPS as well as user selectable automatic shut-of, replacable pH electrode cartridg, stability indicator and automatic calibration, Order Information:, HI 98128 (pHep5) are supplied with HI 73127 pH electrod, HI 73128 electrode removal too, batteries and instructions, Specfications: Range pH -2, 00 to 16, 00 pH, Temperature -5, 0 to 60, 0C / 23, 0 to 140, 0F, Resolution pH 0, 01 pH, Temperature 0, 1C / 0, 1F, Accuracy 20C pH 0, 05 pH, Temperature 0, 5C / 1F, pH Calibration automati, at one or two points with two sets of standard buffers (pH 4, 01 / 7, 01 / 10, 01 or pH 4, 01 / 6, 86 / 9, 18), Temperature Compensation Automatic, Battery Type / Life 1, 5V (4) / approximately 300 hours of continuous use; auto-off after 8 minutes of non-use, Environment -5 to 50C (23 to 122F); RH max 100%, Length: 8, 2, Height: 1, 3, Width: 2, 7 SKU: HNNI008