Technical specifications: pH measurement Range: 0.00 ~ 14.00 pH Resolution: 0.01 pH Accuracy: 0.1 pH TDS measurement/EC measurement Range: 0~19999uS/cm Resolution: 1S/cm Accuracy: 2% FS Temperature measurement Range: 0~60C (32~122F) Resolution : 0.1C (0.2F) Accuracy: 0.5C (2F) Battery type: 3 x 1.5 V (LR44) Automatic temperature compensation: 0~60 Ambient temperature: 0~60 Convenience use: ph meter 5 seconds know the water quality, accuracy, faster. This Combo set of TDS PH EC Temperature. Besides, it has the best price, reliable quality, all make it your first water quality test. High Accuracy Tester: pH meter: The measuring range is 0.00 to 14.00 pH; The resolution is 0.01 pH; Accuracy is 0.01pH. TDS/EC meter: The measurement range is 0-19999ppm; Resolution 1ppm; Accuracy is 2%. Thermometer: The measuring range is 0-60C/32-140F, The resolution 0.1; Accuracy is 0.5C Powerful: The pH tester is able to self-calibrate at three points (accuracy is 0.01ph). No adjustment needed before use. It is very convenient to use. The pH test pen also has an automatic temperature compensation function, which allows you to obtain more accurate test values. At the same time, it will automatically shut down when you haven't used it for 5 minutes, thus extending the service life of the product. Wide Application: The pH meter is suitable for various tests pH liquids, such as drinking water, fishing, aquariums, swimming pools, school laboratories, food, beverages, reverse osmosis systems, hydroponics and SPA.