Bluelab Truncheon — Nutrient EC MeterBluelab Truncheon The Classic Hydroponic Nutrient Meter The iconic stick shaped nutrient meter from Bluelab drop the probe end into your reservoir for 1 2 minutes to match the solution temperature, and read the LED bar display showing conductivity (EC), PPM (500 and 700 scales), TDS, or CF. Hard to overstate how useful this tool is once you own one, you check every reservoir reading before every feed. Why growers choose the Bluelab Truncheon: Fast,
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