In the new version, the ITDS-01 water quality tester has a calibration function.
Please press the Hold button for 3 seconds, the default value of 100 will flash.
Short press the Shift button, the current coefficient can be adjusted (range 50-150), and the coefficient is a percentage.
Short press the Hold key to exit and save the current setting.
For example, the default coefficient is 1, which is 100%. If the tds reading is 199, then the reading is 199100% = 199
If the coefficient is +0.1, then the reading is 199110% = 218.9 ≈ 219
If the coefficient is -0.1, then the reading would be 199*(1-0.1)=179.1≈179
Please note that if the ITDS-01 water quality tester is restarted, its calibration value will need to be readjusted.