MEASUREMENT EQUIPMENT: This kit contains 1 pH meter + 1 TDS EC thermometer + 1 Bio Energy Test Pen + 3 pH calibration powders (250 ml) + 2 instructions for use. Ideal for home or laboratory. Do not hesitate to contact us if you have any questions about product quality. We will give you a satisfactory answer. .HIGH PRECISION & ATC FUNCTION: pH meter numbers range from 0.00 to 14.00 (PH), pH resolution is 0.01 pH, accuracy 0.01 pH. TDS measurement range: 0~9990ppm, conductivity: 0~9990us/cm, accuracy: 2%. Our meters are equipped with reliable Automatic Temperature Compensation (ATC) to ensure accurate readings at different temperatures. .UPDATED TRABLE & LCD DISPLAY: Thanks to its compact size, you can easily take it anywhere. Digital pH and TDS meters are equipped with a clear display, allowing you to read water quality results more accurately. It is also easy to use in dark environments. Both have an auto-shutoff feature that extends battery life. And you can press the CAL keypad to calibrate the device. .VIOLENT APPLICATIONS: Our pH meter to test the pH of different liquids. TDS water hardness meters and EC testers are designed to check the quality of liquids such as drinking water, aquariums, swimming pools, spas, ponds, well water, etc. . which helps to ensure water security on a daily basis. A professional measuring instrument for measuring conductivity, hardness and water temperature of all liquids. .