Bluelab - 2.77 EC Calibration Solution Bulky Safety: Built-in thermal overload protection

Safety: Built-in thermal overload protection device

Why the extended window matters

In the event of a leak

Pipework: 6mm internal diameter (9mm external)

Transplanting (most effective)

Bluelab - 2.77 EC Calibration Solution Bulky Safety: Built-in thermal overload protectionBluelab 2. 77 EC Calibration Solution Laboratory Standard Conductivity Testing Best for: Growers who need to keep their EC meters accurate and their nutrient readings trustworthy Our thoughts This isn't a glamorous product, but it's absolutely essential if you're serious about consistency. Your EC meter is only as good as your last calibration check. Bluelab solutions are made to laboratory standards, and this one ensures your probe is reading true.