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SPECIFICATION: - Range: 0-9990ppm(mg/L) - Temperature range: 0-50°C/ 32-122°F - Accuracy: ±2% - Temperature compensation: 0- 50°C - Battery: 2 x LR44 button cell (included) - Battery life: approx. 1000 hrs - Operating temp: 0°C-60°C - Auto-off time: 6 min - Volume: 144×23×13mm/5.7''x 0.9''x0.5'' How to use it: 1. Please unplug the electrode sleeve before use. 2. Press the switch, place the electrode into the test solution. 3. After the numerically stable, press the HOLD button and take it out of the solution to read. 4. After reading, turn off the meter, wipe clean the electrode before sleeving it.