DSmith
Well-Known Member
Does anyone have a recommended TDS meter? I'm interested in measuring the TDS of RO water from my grocery store. My city water is about 500 ppm TDS (Wards Lab test), and I've read that a well maintained RO unit should produce <20 ppm TDS water.
How often do you calibrate a TDS meter?
How often do you calibrate a TDS meter?