The Bluelab OnePen™ combines precision, convenience, and durability in one compact device. Designed for nutrient solution monitoring, it delivers pH, electrical conductivity (EC/TDS), and temperature measurements—all displayed simultaneously. Featuring a replaceable double-junction pH probe, titanium EC electrodes, and a backlit display with 0.01 pH resolution, it’s built to last with an IP68 dust- and waterproof rating. Pair it with the Edenic app over Bluetooth for instant data access, updates, and real-time monitoring. Perfect for professionals and hobbyists alike.
