HM DIGITAL TDS / EC calibration solution 342 ppm

TDS meter calibration solution 342 ppm to re-calibrate your meters periodically.

1. HM Digital meters come factory calibrated (at 342 PPM) and are ready to use. They are designed to stay consistent. However, after prolonged usage, it may help to recalibrate your meter using a commercial standard NaCl-based solution, which is approximate, 0.5 microsiemens of conductivity.

2. Immerse the meter in the calibration solution. If the meter does not read within 2% of the calibration solution, adjust the reading by inserting a mini screwdriver (not included) into the trimmer pot (the hole on the back of the meter). Turn the trimmer clockwise to increase the reading and counter clockwise to decrease the reading. Note that the adjuster is very sensitive.

NOTE : HM Digital products are calibrated with a 342 PPM NaCl solution. This is suitable for most applications. However, if you are measuring samples that are consistently over 1000 PPM, it is recommended to recalibrate the meter for that specific application.