TDS and EC Meter Total Dissolved Solids (TDS) and Electrical Conductivity (EC) Meter Taking TDS Measurements Remove the protective cap. Turn the TDS meter on. The ON/OFF switch is located on the panel. Immerse the meter into the water/solution up to the max. immersion level (2”). Lightly stir the meter to dislodge any air bubbles. Wait until the display stabilizes. Once the reading stabilizes (approx. 10 seconds), press the “HOLD” button to view the reading out of the water. If the meter displays a flashing ‘x10’ symbol, multiply the reading by 10. After usage, shake off any excess water from your meter. Replace the cap. Water Quality Water Scarcity pH Meter Coliform Test Kit TDS and EC Meter Water Monitoring Kit Water Quality Meter