Description: The TDS pH EC meter pens are small in volume, light in weight and convenient in carrying. TDS water quality test pen used to test the water TDS value, water conductivity, in order to judge the degree of pure water. Hold function: TDS tester saves measurements for convenient reading and recording. Large and easy-to-read LCD screen to display. Products can be widely applied to water industry, drinking water industry, family, individual staycation, field for operation as drinking water quality inspection tools. High Accuracy, quick testing and obvious results. Simplest and cheapest way to test the water quality, see the condition of your drinking water. Specifications: Material: plastic. Color: show as pictures. TDS Meter: TDS range: 0-9999PPM. Auto shut-off: 10minutes. Data hold. Auto temperature compensation. for Dimensions: 14.2*2.3*1.3(CM). Battery: 2*LR44 cell batter(not included). PH Meter: Measuring pH Range: 0.0 - 14.0 pH. Resolution: 0.1 pH. Accuracy: ±0.1 pH. Size: 15*3*1.5 cm. Batteries: 3 x LR44 cell batter(not included). ?EC Meter: TDS range: 0-9999ppm. Degrees Celsius: 0.1-80.0℃. Degrees for Fahrenheit: 32.0-176.0°F. Size: about 15.2cm*3cm*1.4cm. This product requires a 3V CR2032 button battery(battery is not included). Package Include: 1 * TDS Meter. 1 * pH Meter. 1 * TDS EC Meter.