Posted by a reviewer on Amazon

It calls for glycerin but we found that cooking oil works just as well

Posted by a reviewer on Amazon

You will notice that checking calibration block with meter on a different material setting will not produce calibration value since block is steel

Posted by a reviewer on Amazon

Does not get a reading when shooting into an irregular shapes or too close to edges

Posted by a reviewer on Amazon

Only sand enough so that coupling fluid has easier time taking up space

Posted by a reviewer on Amazon

No serial number to follow up calibration nor certificates but i guess these can be gotten by a third party

Posted by a reviewer on Amazon

Surface finish does seem to influence measurement by a few thousandths

Posted by a reviewer on Amazon

Same part with mill finish on one side and polished on opposite side read differently depending on which side the sensor contacted

Posted by a reviewer on Amazon

Since my primary use is to measure wear over time the repeatability is more important than absolute accuracy