Rinse the probes of a TDS meter in clean water. Shake the water off of the meter and turn it on.
Place the probes of the TDS meter into the liquid calibration solution up to a point between the "min" and "max" lines.
Compare the reading of the meter with the reading on the bottle. If the two readings are not the same, insert a mini screwdriver into the back of the meter. The hole that you stick the screwdriver into is known as a trimmer pot.
Turn the screwdriver clockwise to increase the reading of the TDS meter, or counterclockwise to decrease the reading. Adjust the meter until it matches the specifications of the calibration liquid.
Things You Will Need
- TDS calibration solution
- TDS meter
- Mini screwdriver
- Read the calibration procedure instructions that come with your TDS meter. The calibration procedure may vary slightly among various models of meter. Purchase and use the calibration solution that is recommended for your specific model of meter.