Bluelab EC Pen – Waterproof Nutrient Strength Meter

Check nutrient strength in seconds, not guesswork

The Bluelab Conductivity Pen is a compact, fully waterproof EC meter for a fast, reliable read on nutrient strength without carrying a full meter to every reservoir. It is built to survive life around water and nutrient tanks, floating if dropped in rather than just tolerating a splash.

Key Benefits

• Fully waterproof and floats, built to survive a dunk in the reservoir.
• Reads EC, CF, ppm 500 and ppm 700, so you can work in whichever unit you know.
• Automatic temperature compensation corrects readings as solution temperature shifts through the day.
• Factory calibrated, ready to use out of the box with calibration optional.
• Hold function and auto-off to capture a reading away from the tank and save battery.
• Pocket-sized for moving between reservoirs across a bigger grow.

Not sure why nutrient uptake keeps stalling?

Feeding at the right EC matters as much as the nutrients themselves: too strong and plants show tip burn and slowed growth; too weak and you get pale leaves, stretch and poor yields. A quick check at every feed keeps strength in the correct window for the plant's stage instead of relying on the same mix each time.

How to Use

• Dip: remove the cap, submerge the electrode fully in the solution or runoff and swirl gently.
• Read: wait for the value to settle, then select EC, CF or ppm with the mode button.
• Rinse the tip with clean water after each use and replace the cap.
• Calibration: none required routinely; check against a known EC standard if a reading ever looks off.