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Accurate and durable Pen Type Meter Great for all home and laboratory pH testing Measuring range: pH 0.0 - 14.0 Resolution: 0.1pH Accuracy: ±0.1pH (at 20℃/68℉) Typical EMC DEV: ±0.2pH Battery: 3*1.5v (button battery) Operating temperature: 0℃to 50℃ (32℉- 122℉) Relative humidity: ±95% Life: Approx. 700 hours of use Trimming: By potentiometer Compact, portable pen type pH meter for testing High accuracy Approx. 700 hours of use One-Button operation