High-precision measurement: the accuracy range is 0.01pH. The Advwin pH Tester has a sensitive sensor that reads accurate pH levels within 30 seconds and is suitable for indoor or outdoor use.Easy to calibrate: turn on the switch, put the probe into the water and stir. Once the value has stabilized, the value can be read. Using calibration buffers, you can easily calibrate your tester. The portable size allows you to easily carry the miniPH meter in your pocket for taking measurements anytime, anywhere.Automatic temperature compensation: no need to care about the temperature of the measured liquid. The built-in ATC can accurately measure the pH value of the sample in the range of 0C-60C.Healthy Living: Drinking water should have a pH between 6.5 and 8.5 to meet EPA standards. This pH meter tells you the pH of your water to keep it healthy.IMPORTANT NOTICE - 1. Do not use it to test water. Do not touch stones or hard rocky soil, if the soil is too hard and dry, it is easy to damage the probe. 2. Do not use it to test liquids. For testing soil only. 3. Wipe the probe clean after use.No battery providedPower mode:Button batteryPackage:1 x Advwin Digital PH Meter3 x Calibration Solution Powder(Package contents: Only the above package contents, excluding other products.)size:15.5*2.9*1.6cm(Reminder: The size is measured manually, please allow 1-2 cm measurement error)color:yellow colors(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)