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Bluelab pH Pen
The Bluelab pH Pen is a compact, professional‑grade tool for fast, accurate measurement of pH and temperature in nutrient solutions. Designed for everyday growers and hydroponic professionals alike, it ensures your plants receive the ideal pH range for optimal nutrient uptake and growth.
Featuring a double‑junction pH probe, automatic temperature compensation, and a bright back‑lit display, the pH Pen delivers dependable readings in all growing conditions. Waterproof and floatable, it’s built for practical, hands‑on use in tanks, reservoirs, and systems of any size. With simple two‑point calibration and a 30‑day reminder, maintenance is minimal while accuracy remains reliable.
Accurate & Reliable
Provides precise pH readings
Built for Growers
Waterproof, floatable design with durable housing
Easy Calibration
Two‑point calibration with visual reminder ensures continued accuracy
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Bluelab pH Pen
Key Highlights
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- Measures both pH and temperature (°C/°F)
- Automatic temperature compensation for accurate readings
- Double‑junction pH probe resists contamination for longer life
- Two‑point calibration with 30‑day calibration reminder
- Fully waterproof and floatable design
- Back‑lit LCD screen for clear readings in all lighting conditions
- Powered by a single AAA battery
Directions for Use
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- Remove the cap and rinse the probe in fresh water before use.
- Submerge the probe in your nutrient solution.
- Wait for the reading to stabilise, then note the pH value.
- Rinse the probe after each use and replace the storage cap with KCl solution.
- Calibrate monthly or as required using Bluelab pH 4.0 and 7.0 solutions.
Technical Specifications
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- Measurement Parameters: pH, Temperature (°C/°F)
- pH Range: pH 0.0 – 14.0
- Temperate Range: 0 – 50 °C (32 – 122 °F)
- pH Resolution: pH 0.1
- Temperature Resolution: Temperature 1 °C ( 1 °F)
- Accuracy @ 25 °C / 77 °F: pH ± 0.1
- Power Supply: 1 × AAA alkaline battery
- Calibration: 2‑point calibration (pH 4.0 & pH 7.0 solutions)
- Temperature Compensation: Automatic
- Construction: Waterproof and floatable housing
- Operating Environment: 0.2 EC and above | 0 – 50 °C (32 – 122 °F)
- Warranty: 1 year limited warranty
- Box Contents
1 × Bluelab pH Pen
1 × Bluelab pH 7.0 Calibration Solution (18 ml single‑use sachet)
1 × Bluelab pH 4.0 Calibration Solution (18 ml single‑use sachet)
1 × Bluelab KCl Storage Solution (18 ml single‑use sachet)
Resources
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Shipping & Returns
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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.
To start a return, you can contact us at info@hydrooasis.com.au
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.
You can always contact us for any return question at info@hydrooasis.com.au.
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I’ve used Bluelab pH Pens for years and still consider them one of the better handheld pH meters available.
They’re reliable, well made and very easy to use. The digital display is clear and shows when calibration is required.
They are definitely expensive compared with many other pH pens, but I do believe you get what you pay for. As long as the probe is stored correctly, calibrated when required and never allowed to dry out, you should generally get around a couple of years of use from one.
Like any pH probe, it will eventually need replacing, and the lifespan depends heavily on how well it is maintained. Personally, I’d rather pay more for a meter I trust than constantly question whether a cheaper pen is giving me an accurate reading.
For transparency, I am the owner of Hydro Oasis. I personally used the Bluelab pH Pen for years before switching to the Bluelab OnePen, which measures both pH and EC. For anyone only needing to measure pH, this is still the pen I would recommend.