The Bluelab OnePen™ is a next-generation 3-in-1 digital meter designed for professional growers who demand precision, simplicity, and reliability. Measuring pH, electrical conductivity (EC), and temperature in one compact, waterproof device, it streamlines nutrient management and solution monitoring for all hydroponic and soil-based systems.
Engineered with Bluelab’s latest sensor technology, the OnePen™ features a double-junction pH probe and titanium conductivity electrodes for exceptional accuracy and longevity. Bluetooth connectivity allows seamless pairing with the Bluelab Edenic app, enabling live data logging, trend tracking, and calibration reminders directly from your phone. With a replaceable probe module, high-resolution readings, and an ergonomic waterproof housing, the OnePen™ offers professional-grade performance in a portable format that’s built to last.
All-in-One Precision
Measures pH, EC, and temperature simultaneously
Smart & Connected
Bluetooth-enabled for data logging, monitoring, and calibration tracking via the Edenic app
Durable Design
Rugged IP68 waterproof build with replaceable probe and titanium EC electrodes
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Bluelab One Pen
Regular price$359.99
Regular price$399.99Sale price$359.99
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Key Highlights
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3-in-1 measurement: pH, EC (or CF/PPM), and temperature (°C/°F)
High accuracy with 0.01 pH and 0.01 EC resolution
Bluetooth-enabled for app integration and data logging
IP68 waterproof and dustproof housing
Replaceable probe assembly for sustainable maintenance
Backlit display for easy readability in all lighting conditions
Includes calibration and storage solutions
Directions for Use
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Rinse the probe in fresh water before use.
Submerge the probe in your nutrient or water solution.
Wait for the readings to stabilise, then view pH, EC, and temperature values on the screen.
After use, rinse thoroughly and store with KCl solution in the protective cap.
Calibrate regularly using Bluelab pH 4.0 and 7.0 solutions, following on-screen or app-guided prompts.
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
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Key Highlights
Directions for Use
Technical Specifications
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