Description Features: 4 In 1 Function: This water quality tester can measure the PH, total dissolved solids, EC and temperature in time, and help you fully understand the water quality of the tested water. Large Display Screen with Backlight: The large display screen with backlight allows you to read the testing data normally even in dim light or even in total dark environment. / Unit Conversion Function: You can freely change the temperature units between and according to your needs. Automatic Temperature Compensation: With automatic temperature compensation function, the meter can accurately determine the pH value of the sample in the temperature ranges of 0 C~60 C. Portable SizeWide Applications: This pen type tester with pocket size and you can use it to measure the pool, pond, drinking water, spa, wines and other liquides. Specifications: Material: plastics Measurement ranges: PH: 0.00~14.00pH Total dissolved solids: 1-19999ppm Temperature: 0-60 /32-140 Resolution: PH: 0.01pH Total dissolved solids: 1ppm Accuracy: PH: 0.05pH EC: 2% Total dissolved solids: 2% Temperature: 0.5 Auto power off: 5 minutes Power: 3 * LR44 battery (NOT INCLUDED) Display size: 33*24mm Item size: 180 * 37mm / 7.1 * 1.5in Package size: 240 * 80 * 50mm / 9.4 * 3.1 * 2.0in Package weight: 171g / 6.0ounce Packing list: 1 * Water Quality Tester