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Once the meter is on, the temperature function can be used, in or out of liquid. 2. Press the TEMP button. The display will switch to temperature (in Celsius only). 3. To return to TDS mode, press the TEMP button.Precautions 1. The meter is Pre-calibrated. Do not dip the meter beyond the water level limit. 2. Do not store the meter in high temperatures or direct sunlight. 3. Do not attempt to open the housing or tinker with the electronics of the unit.You can also measure Input and Output TDS of the water purifiers and filters.Important....to check TDS of output water of RO Water Purifier, As using it you will be able to find out how effective water purifier is or does it need any part replacementAuto-off function which turns it off after 10 minutes of inactivity. Highly Efficient and Accurate productThis is a digital TDS meter tester for testing the purity of water , Micron Rating: 0.3, Filter Material: Polypropylene (PP)This item can be used in water purifiers and filters, food (vegetable, fruits) drink quality monitoring, pools, spas, aquariums and hydroponic. The product comes with Hold Function and a Built-in digital thermometer for temperature measurement Includes a carrying case