This compact handheld micrometer is incredibly easy to operate and fits comfortably in the palm of your hand. Measures to .0005” accuracy up to 0.5”. Can also measure in mm (0.01mm accuracy up to 12.7mm). The anvils are spring activated to UNLOAD the anvil, so you have complete control of the downward pressure or you can remove the back plate (4 screws) and remove the spring entirely. Takes standard SR44 battery (included)