About 4 months ago I asked what tds meter I should buy. The Hanna PWT was highly recommended, so that's what I bought. It has sat here because I can't figure out how to change the reading to ppm (on paper). Someone said that this meter is pretty close to a ppm reading, but how close?
Can someone tell me what the reading should be for 10, 15, and 20 ppm solutions? Or maybe a formula I can use?