Test indicators have the
lowest discrimination when compared with indicators and comparators. Test
indicators used mainly for set up and comparative production part checking.
Test indicators often use a cantilevered stylus or level style probe that
facilitates inspection of hard to reach part features, but results in high
cosine errors. A cosine error of 0.0006" may result over a travel range of
0.010". Test indicators are not considered absolute measuring instruments,
but comparative tools for checking components against a standard or
zeroing-out setups.
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