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A conductivity probe can silently drift out of accurate range without any obvious sign, throwing off EC and PPM readings across your whole nutrient program. Bluelab 2.77 EC Conductivity Standard Solution solves this by giving you a known reference point to check your probe's accuracy against, so drift gets caught before it affects your feeding schedule.
Testing against the 2.77 EC standard regularly, especially after cleaning your probe, helps confirm readings are still on target and keeps your EC/PPM accuracy dependable over time. It's a fundamental part of any grower's maintenance toolbox, whether you're running a single handheld meter or a full commercial monitoring setup.
Available in 250ml (8.4fl.oz.) and 500ml (16.9fl.oz.) single bottles, as well as box-of-6 case packs of each size — choose the option that matches your usage and restocking needs from the size selector.
A known 2.77 EC reference point catches drift in tools like the Bluelab Truncheon Meter early.
Testing after cleaning confirms your probe is still accurate.
250ml and 500ml bottles, plus box-of-6 case packs of each.
| Option | Volume |
|---|---|
| Single Bottle | 250ml / 8.4fl.oz. |
| Single Bottle | 500ml / 16.9fl.oz. |
| Case Pack | Box of 6 — 250ml / 8.4fl.oz. bottles |
| Case Pack | Box of 6 — 500ml / 16.9fl.oz. bottles |
It's a known reference solution used to check your conductivity probe's accuracy, helping you catch drift before it affects your EC/PPM readings.
Testing regularly, especially right after cleaning your probe, helps confirm your readings are still accurate.
It's available in 250ml and 500ml single bottles, as well as box-of-6 case packs; for portable testing, we also offer the Bluelab Solution Sachet Box.
It's used to verify accuracy rather than calibrate the probe directly — think of it as a check to confirm your probe is still reading correctly.
The box-of-6 case packs are a good fit if you're managing multiple probes or testing regularly, while a single bottle suits occasional use.
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.
