Quote:
Originally Posted by five.five-six
I have one of your units I bought 12 years ago, still running it.
When do i need to calibrate the inline TDS meters?
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One of the downsides of the inline tds meters is that they are factory calibrated with running water. You probably don't have the wherewithal to do that. So.. you can calibrate it once a week if you'd like, but I've found that most people don't calibrate them unless they start getting odd readings. The DM1 only has one calibration pot for both probes. The TRM-1 also has one pot. On the DM2 the probes can be calibrated independently.
Russ