Does anyone have any calibration fluid for a TDS meter? I bought a new RO/DI because my old one was showing about 25 ppm TDS. But since I hooked up my new unit, I am still getting a reading of about 18 so I think I may need to calibrate my TDS meter.
You could use Aquafina drinking water, I tested about five bottles of this stuff with different meters and all the same 0 TDS.
I believe you can use distilled water also if I remember correctly
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