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Yeh as above, these analogue gauges don't really provide useful measurements of vacuum, they only provide an indication of vacuum. So the way to use them is to do a drop test over half an hour to an hour (the longer you drop test, the better your indication will be), then unclamp the part while watching the gauge to see if it moves.
The number it shows is really pretty incidental, it's just about making sure that needle stays rock solid when you unclamp.
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