Investigation used test and analysis-equipment: microscope "keyence- vhx 600 d," digital-camera "panasonic dmc tz8.First we made a visual inspection of both instruments.Apart from the little impact on the tip of instrument "a", we found no damages.Next we made a function test with both instruments.The locking and release function of both instruments worked well and without any abnormalities, batch history review: the manufacturing documents have been checked and found to be according to specification valid during the time of production.Conclusion and root cause: the root cause for the problem is most probably user related.Rational: both instruments are working well and without any functionally deviation.
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