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Product Description: Model PH-2988W Measuring Range PH: 0.00~14.00 PH Temp: 0℃~50℃ (32℉~122℉) EC: 0~19990 µs/cm; 0.00~19.99 mS/cm TDS: 0~19990 ppm; 0.00~19.99 ppt SALT: 0~100.0 ppt; 0~20% Resolution PH: 0.01 PH Temp: 0.1℃ (0.2℉) EC: 10 µs/cm; 0.01 mS/cm TDS: 10 ppm; 0.01 ppt SALT: 0.1 ppt; 0.1% Accuracy PH: ±0.1 PH Temp: 1.0℃ EC, TDS: ±2% F.S SALT: ±2% F.S Automatic Temperature Compensation 0℃~50℃ Operating Temperature 0℃~50℃ Power Supply DC 5V, with power adapter (as per customer requirements), rechargeable battery included Dimensions 130mm x 70mm x 31 mm Weight 180g