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Bluelab pH Pen Meter
€118.75
€139.70
15%
4.92/5
(12 Ratings)
This digital LCD pH meter instantly takes temperature and pH readings; simple and quick calibration.
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Description
The Bluelab's pH gives reliable pH measurements of your grow
Bluelab’s pH Pen is a quality digital device. It’s waterproof, reliable, fast and super easy to use. It also has quite a modern look to it, white with blue details. It’s an incredibly sturdy device. It has a digital LCD screen that shows the temperature (0-50°C) and the pH (0-14) readings. It has three buttons; the first one from top to bottom turns the device on and off, the second button is used to configure the calibration and the third button changes from °C and °F. It comes with 1 AAA battery.
How to use Bluelab pH Pen Meter:
Press the top button to turn its light blue screen on. Now, place it with the sensor first in your water. After a few seconds you should see the exact pH values on the screen; adjust your nutrient solution to 6-6.8 in soil and 5.5-6.3 in hydroponics and coco coir using a pH adjuster. You’ll also need to keep an eye on the water temperature, which comes up along the bottom of the screen. Try and keep it at the same temperature as the room so that your plants can absorb as many nutrients as possible. Make sure that it isn’t too hot or too cold. In order to turn the meter off, press hold the “hold” button for a few seconds and “OFF” will appear on the screen.
Make sure to clean it after every time you use it with filtered water; salts and minerals from your nutrient solution may end up drying and damaging the sensor, which could cause faulty readings in the future. This pH meter comes with a sachet of maintenance liquid in which the sensor will need to be submerged when it’s not in use so that it doesn’t dry up and degrade. The sensor is the part that looks like a sort of bulb.
To change the battery:
Once the battery has run out, you’ll need to get a screwdriver to open the upper part of the device to replace it. We recommend using brand batteries as they last much longer. Make sure to keep it calibrated, checking it at least once a month.
To calibrate it:
In order to calibrate it you’ll need Calibration Solutions; simply place the sensor in the liquid until numbers come up on the screen. Press the CAL button until the word CAL is on the screen, and then repeat the process with the pH 4 solution. We recommend taking care when switching from one solution to the other; you should dry it first so that they don’t accidentally mix.
Technical Specifications:
- PH and Temperature meter 0-14 / 0-50º
- Automatic temperature compensation
- Perfectly submersible - waterproof
- LCD digital screen
- AAA battery
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14/10/2025
Never again without it! Buy cheap, buy twice. Here the value for money is totally worth it.
Translated from German
Nie wieder ohne! Wer billig kauft, kauft zweimal. Hier stimmt das Preis-Leistungs-Verhältnis total.
23/09/2025
Arrived quickly. Measures well and reliably, but I wonder how often you really have to recalibrate it. My old one was really finicky about that.
Translated from German
Kam schnell an. Misst gut und zuverlässig, aber ich frage mich, wie oft man den wirklich neu kalibrieren muss. Mein alter war da echt zickig.
15/09/2025
Good quality, feels premium. Just a shame that the calibration solution wasn't included, I had to order it separately. But the pen itself is top notch.
Translated from German
Gute Qualität, fühlt sich wertig an. Nur schade, dass die Kalibrierlösung nicht dabei war, musste ich extra bestellen. Aber der Stift selbst ist top.
14/09/2025
Before, I only had cheap pens that gave up the ghost after a few weeks. Ever since I've been using this one, my pH is stable and the plants are thanking me for it.
Translated from German
Hatte vorher nur billige Stifte, die nach Wochen den Geist aufgegeben haben. Seit ich diesen nutze, ist mein pH stabil und die Pflanzen danken es mir.
26/08/2025
Got it as a gift and I'm totally thrilled! Would have never treated myself to it, but now I know what I was missing!
Translated from German
Habe ihn als Geschenk bekommen und bin total begeistert. Hätte mir den nie selbst gegönnt, aber jetzt weiß ich, was ich verpasst habe!
23/08/2025
Absolute game changer for my plants! Finally got the pH under control. No more guessing!
Translated from German
Absoluter Game Changer für meine Pflanzen! Endlich habe ich den pH-Wert im Griff. Kein Rätselraten mehr!
09/08/2025
Super precise and mega easy to use. The automatic temperature compensation is pure gold and saves a lot of time!
Translated from German
Super präzise und mega einfach zu bedienen. Die automatische Temperaturkompensation ist Gold wert und spart echt Zeit!
02/08/2025
A must-have for anyone who grows seriously. You notice the quality right away. My yields are noticeably better since keeping a close eye on the pH.
Translated from German
Ein Muss für jeden, der ernsthaft anbaut. Die Qualität merkt man sofort. Meine Erträge sind deutlich besser, seit ich den pH genau im Auge habe.
30/07/2025
Top device! Does exactly what it should. Very reliable and durable, seems like.
Translated from German
Top Gerät! Macht genau was es soll. Sehr zuverlässig und langlebig, so scheint es.
22/07/2025
Does it come pre-calibrated from the factory? Mine showed great values right away, I'm impressed! Ready to go straight out of the box.
Translated from German
Ist der von Haus aus schon kalibriert? Meiner zeigte direkt super Werte an, bin beeindruckt! Direkter Start möglich.
27/02/2022
Hello, can it be kept turned on inside the water tank while adding nutrients and checking how it changes until it stabilises? Thank you very much.
Translated from Spanish
Muy buenas, se puede tener encendido dentro del deposito de agua y añadir los fertilizantes e ir comprobando como varia hasta estabilizarse?
Muchas gracias.
02/12/2020
A bit pricey, but certainly the best quality.
Translated from Spanish
Un poco caro, pero la mejor calidad por cierto.