Conductivity Standard by Flairform — 2.76 EC Calibration Solution for EC, cF & TDS Meters
FF-MTR-EC276-250
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Pairs well with
Flairform Conductivity Standard is a calibration solution for conductivity (EC), cF and TDS meters, made to 2.76 mS/cm (cF 27.6) at 25°C. Regular calibration is what keeps your nutrient readings honest — a meter that's drifted reads low, and you end up overfeeding without knowing it. Formulated with NIST-specified ingredients and stabilised against algae growth for a long, contamination-free shelf life. Available in 250ml and 1L.
Specifications
- EC calibration standards differ between manufacturers — this is a 2.76 mS/cm standard, while Bluelab specifies 2.77, for example. Always check what standard your meter's manual calls for before choosing a solution.
- Clean the electrode with Electrode Cleaner before calibrating. A fouled probe upsets the linearity of readings either side of the standard's value — you'd be calibrating to bad numbers.
- If the meter keeps drifting out of calibration, that's the electrode telling you it needs a clean, not more calibrating.
How to Use
Pairs Well With
Flairform's own rule: clean before you calibrate. Five-minute soak, no rest time.
Meters & Pens – pH & EC TestingEC pens, combo meters and monitors — the gear this standard keeps reading true.
pH Control & CalibrationpH buffers, adjusters and storage solutions — the full accuracy toolkit.
Frequently Asked Questions
Will this work with my Bluelab meter?
No — check your manual first. Bluelab specifies a 2.77 mS/cm standard and its EC probes are factory calibrated, using the standard as a verification check only. This is a 2.76 mS/cm standard, so it suits meters that call for that value. Always match the solution to the standard your meter's manufacturer specifies.
What does 2.76 mS/cm mean in cF and ppm?
2.76 mS/cm equals cF 27.6 at 25°C. For ppm the answer depends on your TDS meter's conversion factor — Flairform publishes a conversion chart covering Hanna, Truncheon and Eutech meters on their downloads page.
How often should I calibrate my EC meter?
Only a few times per year, provided the electrode is rinsed after each use and stored properly. If the meter drifts out of calibration faster than that, the electrode needs cleaning — contamination reduces the probe's effective surface area and drags readings low.
Why do I need to clean the probe before calibrating?
Because a coated electrode upsets the linearity (slope) of readings either side of the standard's value. You'd lock in an error across your whole measuring range. Clean with Electrode Cleaner first, then calibrate.
Does temperature matter when calibrating?
Yes. The standard reads 2.76 mS/cm at 25°C (77°F). Many meters compensate for temperature automatically, but letting the solution and probe sit at room temperature before calibrating gives the most reliable result.
A Drifted Meter Feeds Your Plants Wrong
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