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     EduGorilla 
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    The instruments used for flatness testing are

    1. beam comparator
    2. auto collimators
    3. precision balls and rollers
    4. V-block

    Options :-

    1. 2 and 3
    2. 1, 2 and 3
    3. 3 and 4
    4. 1 and 2
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Reply To: The instruments used for flatness testing are1. beam comparator2. auto collimators3. precision balls….
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