1、The pen end electrode can be directly inserted into the mouth of the drinking bottle for measurement, and the pen cover can also be used as a container for the liquid to be tested, which is convenient to use. 2、Automatic temperature compensation, this water quality tester can automatically convert the indicated value to the indicated value at 25 degrees. 3、The measurement is fast. Because of the exquisite bare type sensor elements, a measurement can be completed in 5 seconds. 4、Easy to clean, the electrode protective cover can be removed for cleaning the probe and the sheath. 5、If you encounter any problems in use, please contact us in time to solve them, we will be happy to solve the problem for you. Item Type: Total Dissolved Solids Meter Material: Plastic Size: Approx.16 x 3cm / 6.3 x 1.2in Battery Type: CR2032 Button Battery Battery Model: DC3V Battery Capacity: 230mAh (Shipped with Built in Battery) Total Dissolved Solids Detection Range: 0 to 9999ppm Conductivity: 0μs/cm to 9999 μs/cm Accuracy: ±2%f.s Temperature Detection Range: 0 to 99℃ (32 to 212℉) Use Environment: 0 to 50℃ Maximum Relative Humidity 95% Uses: Suitable for Water Quality Testing in the Water Treatment Industry, Water Industry, Family, Personality Home Travel, Field Operations, Swimming Pools, Etc. Weight: Approx.64g / 2.3oz 1 x Total Dissolved Solids Meter 1 x User Manual 1 x Storage Bag