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Generally, the thermoplie surface is a ceramic or metal plate with a special coating. It would likely take a good bit of force to put a hole in the surface.
- Use 3 cheap but stable red lasers just in case one of them loses power sometime in the future so I could know which one changed. If they all change then the meter might be getting out of calibration. (100mW to 150mW to keep costs down)
- Make sure they were under powered to preserve diode life and only put 1 minute on them every year to check calibration.
- Put brand new batteries in every year before the check.