I have a blue lab truncheon. High quality. It's right. Look at your plants. Do they look bad? I've heard of people running ppm's really high and their plants are fine. So as long as the plants look ok, don't worry. That's a great meter. I paid $99 for mine. How much did you pay for yours?
Gen Reviewed by Gen 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