Bluelab Conductivity Pen

Know Your Nutrient Strength in Seconds, EC + PPM + Temp

Over- or under-feeding wastes nutrients and stresses plants, and you cannot see nutrient strength by looking at the water. The Bluelab Conductivity Pen measures conductivity from 0.0 to 10.0 EC with ±0.1 accuracy, so you know exactly how strong your solution is. It is factory calibrated, so there is no setup before the first reading.

Its size and simple controls suit home growers mixing nutrients by the bucket, while commercial staff use it for quick spot checks between fixed monitors. Pair it with the Bluelab pH Pen for a complete handheld system.

Key Features & Benefits

• Three conductivity scales — reads EC, ppm 500 (TDS) or ppm 700 to match your feeding chart.
• Factory calibrated — ready to measure immediately; calibration is optional.
• Automatic temperature compensation — keeps EC readings comparable as solution temperature changes.
• Waterproof and floats — handles splashes and recovers easily if dropped into a tank.

Who Should Use the Bluelab Conductivity Pen

Any grower who mixes nutrients and wants to confirm feed strength, from hobby hydroponic systems to commercial reservoirs. It is especially useful when following a feeding chart written in EC or ppm.

About Bluelab Conductivity Pen

The Bluelab Conductivity Pen measures conductivity and temperature and runs on 1x AAA battery. It carries a 1-year limited warranty and pairs with the Bluelab pH Pen for full nutrient solution checks.

Frequently Asked Questions

What does EC tell me about my nutrient solution?

EC (electrical conductivity) measures the total dissolved salts in the solution, which rise as you add nutrients. A higher EC means a stronger feed. Tracking EC helps you avoid both nutrient burn and underfeeding.

What is the difference between ppm 500 and ppm 700?

Both convert the same conductivity reading into parts per million using different conversion factors. Nutrient brands and regions use different scales, so the pen lets you choose the one that matches your feeding chart. Always compare readings on the same scale.

Does the Conductivity Pen need calibration?

No calibration is required before use because the pen is factory calibrated. Calibration is optional if you want to check it against a 2.77 EC conductivity standard. Keeping the sensor clean is the main maintenance task.

Can it measure pH?

No. The Conductivity Pen measures conductivity and temperature only. Add the Bluelab pH Pen, or buy the pH and Conductivity Starter Pack, to measure both.