Bluelab OnePen 3-in-1 pH, EC & Temperature Meter for Nutrient Solutions

PENONE takes the guesswork out of nutrient management. Its replaceable double-junction pH probe resists contamination while titanium EC electrodes deliver stable conductivity readings. A bright backlit display shows pH and EC side-by-side, with temperature on tap and automatic compensation so your numbers stay trustworthy across changing conditions.

Pair over Bluetooth to the Edenic app to log every reading, visualize trends, and share data instantly with your team. With IP68 sealing, PENONE shrugs off splashes and dunking—and yes, it floats—making it a reliable tool for hydroponics, coco, and recirculating systems.

Key Features

• 3-in-1 measurements: pH, conductivity (EC/TDS), and temperature for dialed-in nutrient uptake

• Replaceable double-junction pH probe + titanium EC electrodes for longevity and stability

• Backlit, high-contrast screen with simultaneous pH + EC readout

• Fine 0.01 pH resolution with simple 2-point pH calibration and probe-health indicator

• Temperature compensation and readouts in °C or °F

• Multiple conductivity units: EC, mS/cm, CF, ppm 500 (TDS) or ppm 700

• IP68 dustproof & waterproof—rugged, floats, built for greenhouse and grow-room use

• Compact, ergonomic design that’s comfortable for all-day checks

• Smart & Connected: Bluetooth to the Edenic app for remote viewing, history, data sharing, and software updates