Description Product Description: Test pen specifications are as follows: 1) Portable and lightweight - weighing 28 grams, it is the smallest and lightest portable TDS instrument on the market today. 2) Wide measuring range - range 0~9990PPM. 3) Wide application temperature - works at 0-50 degrees and can be stored at minus 30 degrees. 4) Long battery life - 2 CR1620 3V batteries are used, which can be used for more than 2 years. 5) Reasonable design - the electrode at the end of the pen can be directly inserted into the pen mouth The drinking water bottle for measurement, and the pen lid can also be used as a container for the measured liquid, which is extremely convenient to use . 6) Quick measurement - thanks to the exquisite bare sensor element, a measurement can be made in 5 seconds. 7) Easy to clean - the electrode protective cover Can be removed for cleaning probes and ducts. 8) Automatic temperature compensation - it can automatically convert the indicated value to the indicated value at 25 degrees and turn off automatically. 9) High accuracy error of 1%, the titanium alloy probe has high accuracy in water measurement and is free ofMagnetic interference in water. 10) Automatic temperature compensation can automatically convert the indicated value to the indicated value at 25 degrees. Package packaging: water quality detector * 1