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KL-099 Pen-type Waterproof pH/ORP and Temperature 3-in-1 Tester Technical Specifications Measurement Range Redox-ORP -1999 to 1999 mV pH Measurement Range 0.00 to 14.00 pH Temperature 0 to 55°C Resolution Redox-ORP 1 mV pH Measurement Range 0.01 pH Temperature 0.1°C Accuracy Redox-ORP ±5 mV pH Measurement Range ±0.1 pH Temperature ±1°C Automatic Temperature Compensation Range 0 to 50°C Electrode Replaceable pH Electrode; Combination ORP Electrode Power Supply 4 x 1.5V (AG13) Operating Temperature Range 0 to 50°C Dimensions 170mm x 40mm x 23 mm Weight 100 g