Bluelab Truncheon EC Pen

Calibration-free conductivity meter with automatic temperature compensation

The Bluelab Truncheon EC Pen is an extremely durable, calibration-free EC meter for continuous use in hydroponics , coco , or soil . Thanks to automatic temperature compensation, an LED scale, and a low-maintenance design, it delivers precise readings for electrical conductivity (EC), CF, and ppm—without the need for buttons or calibration.

Advantages at a glance

✅ Calibration-free – ready for use & permanently precise
✅ Automatic temperature compensation
✅ Display via long-lasting LED scale (EC, CF & ppm)
✅ Splash-proof, robust & battery-operated
✅ Ideal for large systems, continuous operation & quick checks

Features & technical data

Measuring ranges:

• EC: 0.2 – 3.6 mS/cm

• CF: 2 – 36

• ppm 500/700: 140 – 2520 ppm

Additional features:

• Power supply: 3× AAA batteries (included)

• Material: Waterproof, robust plastic housing

• Length: approx. 40 cm – ideal for immersion in large tanks

• Display: Colored LED scale for direct EC reading

Application & Notes

Suitable for: Hydro, Coco, RDWC, DWC, soil with drain water
Especially recommended for: large systems, greenhouses, continuous operation
Care: Rinse with distilled water after use – no calibration required
Tip: For complete control, add a pH meter (e.g. Bluelab pH Pen)

→ Simply immerse, read the LED value, and you're done. No buttons, no menu.