Bluelab EC Pen (Conductivity Pen)
The quick, handheld way to keep nutrient strength in the sweet spot.
The Bluelab EC Pen (Conductivity Pen) tells you whether your nutrient solution is too weak, too strong, or right where it should be. It measures conductivity (EC or ppm) plus solution temperature, giving you the two readings that help prevent overfeeding, underfeeding, and avoidable plant stress in hydro, coco, and reservoir-fed setups.
Why EC matters
- EC shows nutrient strength, so you know what you are actually feeding.
- Daily EC checks help prevent drifting too concentrated or too diluted.
- More consistency means fewer deficiencies, less burn, and steadier growth.
Why temperature matters
- Root health depends on solution temperature, especially in recirculating systems.
- Recommended nutrient solution temperature: 18–22°C (65–72°F).
How to use it (simple routine that works)
- Stir your reservoir or feed tank well before testing.
- Dip the pen, wait for the reading to stabilise, and record your EC/ppm.
- Top up between changes to keep strength consistent, then refresh the reservoir regularly.
Complete your nutrient toolkit
EC tells you the strength of your feed, but pH controls nutrient availability. Pair this with the Bluelab pH Pen so you can manage both strength and uptake properly.
Best for
- Hydroponic reservoirs and recirculating systems
- Coco grows where nutrient strength swings show quickly
- Growers who want a fast daily check without overcomplicating feeds
Price: £74.95