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Traditional conductivity meters mean regular calibration checks before every use — time growers stirring nutrient reservoirs don't have. While the Bluelab Conductivity Pen offers a compact alternative, the Bluelab Truncheon Nutrient Meter skips the calibration step entirely: dip it into solution and read CF, EC, PPM 500, or PPM 700 instantly, with automatic temperature compensation built in.
Built tough and fully waterproof, the Truncheon's long-format design lets it double as a stirring tool while you mix and measure a reservoir at the same time. Automatic liquid detection triggers bright LED readouts, and its simple, no-calibration operation makes it easy to clean, disinfect, and hand off between grow rooms without downtime.
As the original industry-standard nutrient meter, the Truncheon has earned its reputation for reliability that holds up to constant use. For those running high-strength nutrient programs, the Bluelab Commercial Truncheon Nutrient Meter provides an expanded range up to 6.0 EC. There's no probe to swap, no solution to store, and no setup routine to walk new staff through — just a durable meter that delivers a consistent reading every time it touches solution.
Robust, reliable construction stands up to daily reservoir use for the long haul.
Bright LEDs indicate readings automatically for simple, glanceable results.
Doubles as a stir stick, so you can mix and measure your reservoir at once.
Skip the setup — easy to clean and disinfect between uses.
Measures conductivity in EC, CF, PPM 500 (TDS), or PPM 700.
| Specification | Value |
|---|---|
| Conductivity (EC) Range | 0.2–3.6 mS/cm |
| Conductivity (EC) Resolution | 0.1 |
| Conductivity (EC) Accuracy | ±0.1 |
| CF Range | 2–36 |
| CF Resolution | 1 |
| CF Accuracy | ±1 |
| TDS (ppm 500) Range | 100–1,800 |
| TDS (ppm 500) Resolution | 50 |
| TDS (ppm 500) Accuracy | ±50 |
| ppm 700 Range | 140–2,520 |
| ppm 700 Resolution | 70 |
| ppm 700 Accuracy | ±70 |
| Operating Environment | Nutrient solution, 32–122°F (0–50°C) — do not use or store outside this range |
| Power | 3x AA alkaline battery |
The Bluelab Truncheon Nutrient Meter is covered by a 5-year limited warranty.
No. The Truncheon requires no calibration — simply dip it into your nutrient solution and read the result directly off the LED display. You can periodically verify your tool's accuracy using Bluelab 2.77 EC Conductivity Standard Solution.
It reads nutrient concentration in EC, CF, PPM 500 (TDS), or PPM 700. For growers who also need to monitor acidity, pairing this with a Bluelab pH Pen ensures all critical water parameters are covered.
Yes. It's built with a fully waterproof, rugged housing designed for repeated dunking and daily reservoir use.
Yes. Readings are automatically compensated for temperature, so you get an accurate result without a separate correction step.
Yes. Its long-format design lets you mix and measure your nutrient solution at the same time.
It runs on 3x AA alkaline batteries.
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
Equipping home growers, craft producers, and commercial operations across North America since 2016.
