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Product Description: Model PH-055 Measuring Range pH 0.00 ~ 14.00 pH Temperature 0 ~ 55°C Resolution pH 0.01 pH Temperature 0.1°C Accuracy pH ±0.1 pH Temperature ±1°C Automatic Temperature Compensation Range 0 ~ 50°C Power Supply Main unit DC 6V, power adapter optional (As per customer request) Operating Environment 0 ~ 50°C Dimensions 65mm x 26mm x 40 mm Weight 75g