Thank you for your honest feedback.
We wish to clarify that the unit's fault (rusty PCB and sensor) could be due from improper storage and also faults like this may occur when units are not regularly sent for calibration at all. In this case, this is the first calibration attempt in 2 years since the unit's purchase. We wanted to fully repair the unit with its 3-years warranty plan however, in order for us to do that, this requires the receipt/copy of bank statement to validate the warranty. Unfortunately, as none of these were provided in the end, we were not able to proceed with the repairs. Based on your request via our last email correspondence on the 22nd of February 2022, we returned the unit to you as it is.
Nevertheless, if you manage to locate the copy of bank statement for the unit's purchase at Autobarn, you can contact us again so we can validate the unit warranty and organise the repair of the unit.