oh ya this meter is junk i have 2 does your battery even charge? mine doesn't and if you hold the ppm meter near a cfl bulb when its on it reads 6000+ppm LOL for some reason the meter even converts tds ec and ppm on the same scale??????? ec1.5 tds.15 ppm150 ????WTF i thought there was supposed to be a .7 conversion?nobody's ran into this???