BlueLab Commercial Truncheon Meter is the perfect nutrient meter for hydroponic systems. With a conductivity range right up to 6.0EC (60CF or 4200ppm), it has been designed to measure a higher than normal EC or CF. This super tough factory calibrated unit is fully waterproof, comes with Auto sense on and off and has a battery life minimum of 1 year. It also has no on/off buttons to worry about! This trusty meter will give you accurate readings for years to come.