Why is my GastroCH4ECK showing a warning sign and a gas cylinder connected to a GastroCH4ECK?

Calibration is Due On GastroCH4ECK

Your device will need calibrating every month, do so by following the calibration procedure in the user manual.

If the problem persists or has not been resolved by the information provided above, please contact Bedfont or your local distributor for more advice.