1. Easy-to-use. Just put the test pen into the water you want to test and press the button, then the TDS(total dissolved solids) of water shows on the display.
2. Superb technique, accurate data. Measure water purity accurately, pay close attention to families'health and safety. The lower the TDS the higher purity water has.
3. Extensively application. You can use it to test the purity of running water, plain boiled water, barreled pure water, cell water, filtered water, aquarium water, and so on.
4. lowenergy and intelligent. The tester has IPX6 waterproof body and lowenergy chip, it will auto off above 2 minutes nonuse.
5. 2 changeable button batteries are built in it.
6. Test range: 0-9990.