FatBud do you know anyone else that has a meter you can compare with or they have calibration solution to test just to make shure. Mine can get to 2000 PPM's sometimes but you start to see tips of leaves burning.
LOC NAR1958 Reviewed by LOC NAR1958 on . EC PPM Hi, I have just purchased a BlueLab EC Monitor for use in my Dripper system, I am a fairly experienced grower and don't have any nutrient probs with my plants, I am using Canna Flores and dilute 40Mls Part A and 40Mls Part B with one litre of water, My tank holds 160 Liters, so that works out at around 600Mls of each part to fill my tank, and I have never had any problems with this. However According to Canna this should give me a reading of around 1.5 - 2.0 EC (thier Website gives different Rating: 5