[Lee.]

My hand held tds meter seems to be 004 ppm when my tds meter on my ro shows the water coming out is 009. I have noticed on the back of my hand held that there is a calibration button. how do I calibrate it?

lee

[freshwater]

You need some callibration fluid, go back to where you got it from and ask them for some.

steve@freshwatersystems.co.uk