Press(in/mm)key to be in metric or lnch system condition.
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Press(ABS)key,the character“REL" appeared,for relative measuring condition.Press(ABS)key again,it will go into absolute measuring codition.
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Press(HOLD)key,the character"H" appeared,Which means going into data hold condition,press(HOLD)key again to wipe it out.easy to record reading
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