You are consolidating your metering because juggling three separate probes results in conflicting readings.
You are upgrading to an app-linked meter because you need to keep a reliable history of your nutrient solution.
The replaceable probe design saves you from buying a new meter when the sensor eventually reaches its end of life.
The backlit screen is a huge upgrade because you can actually read your levels in dim, high-humidity rooms.
Growers who monitor their reservoirs remotely say they catch drift issues before they turn into major plant stress.
Users report that the probe health indicator saves them from guessing if their readings have become inaccurate.
Bluelab OnePen - 3-in-1 pH, EC & Temp Meter
Juggling separate
pH pens and
conductivity pens means double the calibration, double the probes to maintain, and readings that never line up in time. The Bluelab OnePen solves this with a single 3-in-1 probe that reads pH, conductivity (EC), and temperature simultaneously, giving growers one accurate snapshot of nutrient solution health instead of three separate checks.
The pen pairs a
replaceable double-junction pH probe with titanium EC electrodes, displaying pH and EC readings together on a bright backlit screen with 0.01 pH resolution. A built-in probe health indicator flags wear before it affects accuracy, and simple 2-point pH calibration using
pH 7.0 and
pH 4.0 buffers keeps results dependable over time. An IP68 rating protects the pen against dust and moisture in wet grow room and reservoir environments.
Connect the OnePen to the
Edenic app over Bluetooth to view readings remotely, manage data, and keep the pen's software current. Conductivity readings are available in EC, mS/cm, CF, ppm 500 (TDS), or ppm 700—similar to the scales used by the
Bluelab Truncheon Meter—so the OnePen fits whichever nutrient program scale you already use. Plus, the
replaceable probe means a worn sensor doesn't mean buying a new pen.
The Bluelab OnePen is covered by a 2-year limited warranty.
Frequently Asked Questions
What does the Bluelab OnePen measure?+
It's a 3-in-1 handheld that reads pH, conductivity (EC), and temperature simultaneously on a single backlit display, giving you a full nutrient solution picture from one probe.
Can the OnePen connect to my phone?+
Yes. It pairs over Bluetooth with the
Edenic app, letting you view readings remotely and keep the pen's software up to date.
What conductivity scales does the OnePen support?+
It measures in EC, mS/cm, CF, ppm 500 (TDS), and ppm 700, which can be verified for accuracy using a
2.77 EC standard solution.
How do I know when the probe needs attention?+
A built-in probe health indicator flags when the probe needs cleaning or replacement, helping you catch problems before readings drift.
