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I have a Mudder PH / TDS meter. I went to test the water today and the meter wouldn't stabilize, jumping all over from like 8 to 19. Not sure if it needs new batteries or calibrated. Any ideas?
What gets me is that this is a knock-off of the HM Digital TDS meter....that's only a couple bucks more......and this Mudder is known to be inaccurate and unreliable.
Mark, I'd try cleaning it in vinegar over night and then rinsing it well. Then, once you put in in the solution you wish to test, let it sit for a couple minutes before running the test....see if that helps.