Description We don't know how pure drinking water is. Apparently transparent water can contain a lot of impurities. Total dissolved solids can reflect the water quality to a certain extent. The lower the value, the less soluble salts such as heavy metal ions, the purer the water quality. Prameter - Color: Yellow.- Material: Plastic.- Size: 16.2 x 2.9 x 1.5cm.- Battery: DC3V, 230mAh CR2032 button batteries(included).- Measuring Range: 0 ppm-9999ppm.- Temperature Range : 0-990(32- 212)- Conductivity: 0s/cm-9999s/cm.- Accuracy: 2F.S Features - Lightweight pocket - upgrade the third generation of 70 g, the lightest portable total dissolved solids instrument.- Long battery life - use large capacity battery, available for more than 5 years.- Reasonable design - the pen tip electrode can be directly inserted into the mouth of the drinking water bottle, and the pen cover can also be used as the liquid container to be tested, which is extremely convenient to use.- Fast measurement - due to the delicate and bare sensing element, one measurement can be done in 5 seconds.- Easy to clean - the electrode cover can be removed for cleaning the probe and sheath.- Automatic temperature compensation - can automatically convert the indicated value which is equal to the value in normal temperature (25) . Automatic shut-down.- Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Precautions - Avoid immersing the entire instrument in water.- Avoid high temperatures and direct light.- Avoid impact, heavy pressure and other hurting.Packing list: 1 x Water Quality Tester