Why does my ToxCO have an orange circle with 'SEN01' and a date in red below it?

Sensor Change Overdue On ToxCO

The device's sensor change is overdue, contact your local distributor to arrange a service.

If the problem persists or has not been resolved by the information provided above, please contact your local distributor for more information. Find out who your local distributor is from our website here. .