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Product Description: Model SA-0259 Measuring Range pH 0.00 ~ 14.00 pH Salinity 0 ~ 199.9 ppt Resolution pH 0.01 pH Salinity 0.1 ppt Accuracy pH ±0.1 pH Salinity ±2% F·S Operating Temperature 0 to 50°C Power Supply DC 6V, with power adapter (as per customer requirements), includes battery Operating Environment 0 ~ 50°C; Humidity: ≤95% Dimensions 110mm x 51mm x 22mm Weight 200g