View Full Version : Dual Inline TDS Meter DM-1 HM Digital problems

07/13/2012, 08:30 AM
I have had this TDS meter for about 5 years now. after changing all the filters and membrane, I was still getting a reading of 2 on the output of my dual DI. at this point I decided to calibrate the probes, I have a bottle of the 342 Calibration Solution and sure enough it was off, the problem I am having is that when I turn the calibration screw all the way down I can't get it to read any lower than 370. any ideas?


I should also mention I changed the batteries in it also just for good measure but still no luck, and my handheld meter reads the calibration fluid at 342 like it should be.

Buckeye Hydro
07/14/2012, 04:32 AM
Sam - If you'll PM us your email address we'll send you some detailed instructions. Let's work through those as a first step.


10/15/2014, 06:54 PM
I am having this same issue. Is there a way to fix it?

Buckeye Hydro
10/17/2014, 05:40 AM
Probable not. How old is the meter? That meter has a 1 year manufacturer's warranty.