This advanced pH, ORP and Temperature meter specifically designed to provide precise measurements even under harsh conditions. Equipped with ATC, automatically adjust itself to correct temperature discrepancies during use.Use to measure the redox potential of your aquarium, pond, spa or pools and soil. Use it sea water aquarium for controlling of an ozone addition as well as in sea and freshwater basins. Ideally also to the indirect chlorine measurement in the swimming pool and other various industrial application. Features: Uses replaceable pH electrode & ORP electrode With ATC With BNC connections for use with a replaceable electrode Clear readings even in the darkest of environments Easy to use interface and monitors data continuously Specifications: Measuring Range: pH: 0.00 to 14.00pH ORP/mV: 0 to ±1999mV Temp: 0°C to 100°C Accuracy: pH: 0.01pH ORP/mV: ±0.1% F·S±1 digit Temp:±0.4°C Resolution: pH: 0.01pH ORP/mV: 1mV Temp:0.1°C Display: 4-digit LCD Power Supply: 9V Battery (up to 50 hours) Operating Conditions: Room Temperature: 0°C to 50°C Humidity: =95% Input resistance: 10¹²O Dimension: 180mm x 83mm x 46mm Weight: Instrument only: 290g Gross weight: 570g Calibration: (values refer to a temperature of 25°C): Single point in neutral buffer solution Double point in neutral buffer solution plus an acid or alkaline buffer solution Offset regulation range: ±1pH Slope: 85 - 100% Temperature Compensation: Completely automatic with ATC probe. When probe is off, temperature is fixed at 20°C which can be modified with calibration screw. Set Included: 1 x 3-in-1 ORP mV, pH, Temperature Meter 1 x English Manual 1 x Mini-screw driver 1 x Detachable Temperature Probe 1 x Replaceable pH Electrode 1 x Replaceable ORP Electrode 1 x Black protective carrying case 4.003pH & 6.864pH calibration solutions