Refractometer wonky??

[hunggi74]

I bought a BRS 5 stage unit with built in TDS meter about two months ago. Ill get a handheld TDS unit too I guess... The amount if swing I'm seeing in calibration almost makes the unit is busted. Ill take it to J&L and see if they can't calibrate it. Ill also get some calibration fluid from them. Funny, it was them that told me just to use bottled water to calibrate instead of the calibration fluid...