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This Article is about the Fluke-810 and how to fix the issue when the Cal Due Date has expired message pops up on the display. 

The fix for this issue is pretty simple all you have to do is update the firmware in the Fluke-810 and the message will not pop up again.

Here is the location on the Fluke website to obtain the Fluke-810 firmware update tool. 

Fluke 810 Vibration Meter Software and Firmware | Fluke