You are consolidating your nutrient checks because juggling three separate meters leaves you with inconsistent readings when you need to act fast.
You are looking for reliable, real-time data from your reservoir because relying on manual logbooks costs you visibility into how your solution health drifts throughout the day.
The replaceable probe design matters because it keeps your investment going when the sensors reach the end of their life.
Growers who moved to this 3-in-1 meter say they saved significant time because they no longer have to manage three separate probe cleaning routines.
Users who paired their device with the Edenic app say they finally stopped missing nutrient drifts since they get remote alerts on their phones.
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.
