Bluelab Commercial Truncheon Nutrient MeterAn EC meter built to last a lifetime now on a bigger scale Larger scale Measure up to 6. 0 EC, 60 CF, 3000 ppm 500 or 4200 ppm 700 Robust and reliable construction for long lasting value Fully waterproof; splash, submerge or sink we've got you covered Automatically detects liquids and bright LEDS indicate measurement for brilliantly simple functionality Long format design for mixing and measuring nutrient reservoirs simultaneously No calibration