How to resolve the 'Unexpected error: authenticating' on 3M Measuring Instruments?
- SSharon ButlerAug 18, 2025
To address an 'Unexpected error: authenticating' message on your 3M Measuring Instruments, first, confirm that the user ID and passwords are correct. Then, disconnect the 3M™ Clean-Trace™ NGi luminometer from the USB lead, or remove it from the docking station, and reconnect it to upload the results again.










