Bluelab pH Pen
The fast, handheld way to keep pH and nutrient uptake on track.
Plants can only absorb nutrients efficiently when the conditions are right. pH is the switch that controls availability, and if it drifts, growth slows, deficiencies show up, and you end up chasing problems that should not exist. The Bluelab pH Pen gives you a quick, reliable read of pH plus solution temperature, so you can correct issues before they cost you yield.
Why pH and temperature matter
- pH controls nutrient availability so the plant can actually take up what you are feeding.
- Root-zone temperature affects plant performance including growth rate and structure.
- Recommended nutrient solution temperature: 18–22°C (65–72°F).
Key benefits
- Measures pH and temperature in one compact pen.
- Quick checks for reservoirs, feed tanks, run-off and hand-mixed feeds.
- Simple to use so you actually test more often and catch drift early.
- Ideal for hydro, coco and soil wherever accuracy and consistency matter.
Best for
- Hydroponic systems and recirculating reservoirs
- Coco grows where pH control is critical
- Soil feeding where you want consistency and fewer lockout issues
- Growers wanting a reliable “quick check” tool before every feed
How to use
- Stir your nutrient solution well before testing.
- Insert the pen probe into the solution and wait for the reading to stabilise.
- Adjust pH gradually, re-test, and record your result.
- Rinse the probe after use and store correctly to protect accuracy.
Pair it with
For a complete picture of your feed, pair this with a reliable EC/ppm meter to track strength as well as pH.
Warranty
1 year guarantee (proof of purchase required).
Price: £79.99