this tool (based on a magnet) is not exactly cheap but works very
well and is also very reliable. It is possibly similar to the one
suggested by Andrew.
https://www.dictum.com/de/musikinstrumentenbau/werkzeuge-fuer-
musikinstrumentenbau/mess-pruefwerkzeuge/707126/hacklinger-
dickenmessgeraet-version-c-1-magnet
Dietrich
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