Bluelab Truncheon Nutrient MeterImpossibly tough, an EC meter built to last a lifetime Measure up to 3. 6 EC, 36 CF, 1800 ppm 500 or 2520 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 required and easy to