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Main scale reading is -1mm when there is...

Main scale reading is `-1mm` when there is no object btween the jaws In the vernier caliperse 9 main scale divisions matches with 10 vernier scale division The thickness of the object using the defected vernier calliperse will be

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Zero error - main scale reading + (vernier scale reading) (least count)
`= - 1 mm + 6 (0.1mm) = - 0.4mm`
observed reading `= 11.8mm`
So actual thickness `= 11.8 - (-0.4) =12.2 mm` .
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