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This is a digital TDS meter tester used for measuring Total Dissolved Solids present in the water. To measure the purity of water, please use the following instructions. Operating Instructions: 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 maximum immersion level (2 inch). 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. Taking Temperature Measurements Once the meter is on, the temperature function can be used at any time, in or out of liquid. Press the TEMP button. The display will switch to temperature (in Celsius only). To return to TDS mode, press the TEMP button.