A screw gauge is provided with a “ratchet” arrangement, in the form of a knob at the right end of the spindle. The screw should be rotated by this knob only. The purpose of the is device is–

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The ratchet arrangement in a screw gauge ensures that the screw is tightened with a uniform, gentle pressure. This prevents excessive force from being applied to the object being measured, which could deform it and lead to inaccurate readings or damage to the object. It ensures consistent measurements by eliminating variations in user applied pressure.

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