Features： 1、High Accuracy: For high accuracy, a titanium probe and reliable Automatic Temperature Compensation (ATC) ensure consistently accurate readings over a wide range of temperatures. 2、Auto Off Function: Keep the auto off function, freeze the measurement for viewing in water. Turn off the meter after 5 minutes of non use to save battery. 3、ABS Material: Portable water tester uses strong ABS material, which is wear resistant and durable, and can be used for a long time. 4、Simple Operation: Just turn on the PH meter and stir the water gently, then a stable reading will be displayed on the LCD within a few seconds, if there is no operation for more than 5 minutes, the tds ppm meter will automatically turn off. 5、Applicability: The meter is the ideal test kit for home and laboratory use. Ideal for testing water, swimming pools, aquariums, spas, hydroponics, food, wine and beer making and more. Specification： Item Type: Water Quality Test Pen Material: ABS Weight: Approx. 163g / 5.7oz Measuring Range: pH: 0.00-14.00 pH; EC: 0-19990μS/cm Resolution: 0.01 pH; 1 μS/cm; 0.1 DegreeC; 0.1 DegreeF Accuracy: pH: +/-0.01 pH; EC: +/-2%; Temperature: 0.5℃ Battery: 3x1.5V LR44 Button Battery (Not Included) Temperature: 0.1 to 60.0 DegreeC; 32.0 to 140.0 DegreeF Calibration: PH: Three Point Automatic Calibration (6.8, 4.00, 9.18 pH); EC: 1413 μS/cm Automatic Shutdown: 5 Minutes Uses: Ideal for Testing Water, Swimming Pools, Aquariums, Spas, Hydroponics, Food, Wine and Beer Making, Etc. Package List： 1 x Water Quality Test Pen 1 x User Manual 3 x Detection Powder Pack