Specification 
Taking Tds Measurements
1.Remove the protective cup .
2.Press the ON / OFF swich to turn the TDS Meter on.
3.Immerse the meter into the water / solution up to the maximum immersion level (2").
4.Lightly stir the meter to dislodge any air bubbles.
5.Wait until the display stabilizes. Once the reading stabilizes (approx. 10 seconds),
press the HOLD button to view the reading out of the water.
6.If the meter displays a flashing "×10" symbol, multiply the reading by 10.
7.After usage, shake off any excess water from your meter.