Fowler's 54-815-111 Rapid Micrometer set with LIFETIME GUARANTEE has a 0-4”/0-102mm measuring range and flat anvils/spindles with a 0.256" diameter measuring faces for general purpose measuring. The digital display has 0.00005"/001mm graduation intervals for precise readings. The anvil/spindle have hardened, precision-ground, and micro-lapped carbide measuring faces to provide accurate measurements. The spindle thread is hardened, ground, and lapped to provide smooth movement, accuracy, and long life. The adjustable ratchet-stop thimble provides an audible sound and stops turning when the spindle comes into contact with the work piece, providing constant force for consistent measurements between operators. The frame provides durability and is heat-insulated to reduce temperature-related expansion or contraction providing accurate measurements. The micrometer includes a wrench and fitted case. Micrometers 2" and above include a setting standard.
Specifications
Display type
LCD
Anvil/spindle style
Flat
Measuring range
0-1.18”/0-30mm, 1.18-2.6”/30-60mm, 2.6-4”/60-102mm
Graduation interval
0.00005”/001mmm
Spindle displacement
12mm per thimble revolution
Accuracy
0.00012"/003mm, .00016”/.004mm, .0002”/.005mm
Thimble style
Ratchet stop
Anvil/spindle diameter
0.256"
Measuring force (adjustable)
5/10N
IP rating
67 (with or without data cable, available separately)

Micrometers are precision measuring instruments that use a calibrated screw to measure distances. These measurements are translated into large rotations of the screw that are then able to be read from a scale or a dial. Micrometers are typically used in manufacturing, machining, and mechanical engineering. There are three types of micrometer: outside, inside, and depth. Outside micrometers may also be called micrometer calipers, and are used to measure the length, width, or outside diameter of an object. Inside micrometers are typically used to measure interior diameter, as in a hole. Depth micrometers measure the height, or depth, of any shape that has a step, groove, or slot.
Fowler Precision manufactures inspection and measurement instruments such as electronic indicators, calipers, bore gages, and digital scales. The company, founded in 1946, is headquartered in Newton, MA.

Fowler 3 piece 54-815 series outside micrometer set
Standards (for sizes 2" and above)
Wrench
Fitted case