The speeder is always available for quick rotation of the spindle.
Ratchet function works both from the thimble and the speeder.
Audible ratchet operation for reassurance that measurement is being performed at constant, preset force.
More accurate in one-handed operation: inexperienced operators measure significantly more accurately with this micrometer.
A simple mechanism, which requires neither parts maintenance nor special technique, is employed in the constant-force device.
Rotating the thimble/speeder when the workpiece is between the anvil and spindle causes the ratchet mechanism to operate and apply a constant measuring force to the workpiece.