TDS value water quality testing pen is a simple portable water quality testing tool, which is used to test the TDS value of water to judge the purity or pollution degree of water. The products can be widely used in water treatment and drinking water industries, as well as in the fields of family, personal home, tourism, field work, etc., as a judgment tool for testing water quality.
Standard of use:
In general, the lower the TDS value, the less dissolved solids in the water, and the purer the water. The higher the TDS value, the more dissolved solids in the water, and the qualified TDS value is ≤1000mg/L.

TDS detection value:
0 (rarely)

50 (less)

100 (less)

200 (a lot)

500 (unqualified)

Instructions：
1. Remove the pen cover and press the button to turn on.

2. Put the nib into the test solution, and the water should be Probe that submerges the tip of the pen.

3. Shake the tip of the pen lightly twice, after 2-3 seconds the value is stable, you can count the seconds.

4. After use, wipe off the water stains with a paper towel, put the cap back on, and store it in a dry place after turning it off.

Precautions:
Warm water should be used when testing water quality. High temperature water will lead to falsely high values and should not be used to test water temperature higher than 50°C. High temperature will easily damage the test pen.