Bluelab V2 Truncheon CF/EC/PPM MeterBluelab V2 Truncheon CF EC PPM Meter The Bluelab Truncheon CF EC PPM Meter's tough, completely waterproof and famously reliable, making it the favourite nutrient strength meter of growers for years. The Bluelab Truncheon gives you an easy to read, incredibly accurate view of your nutrient strength, so you can make sure your plants are getting exactly what they need, taking you from hobbist to professional. It's no wonder that most growers choose to