The Standard Gage outside digital micrometer set includes a set of digital micrometers and standards for zero-setting, and comes with a fitted case for storage. Each micrometer has a digital single-value LCD readout that displays in inch and metric units with resolution to 0.00005” (0.001mm) for outside diameter (OD) measurement. The micrometer’s electronic microprocessor can set a temporary zero position, and return to a true zero reading. An automatic off function helps preserve battery life when the unit is not in use. The electronics housing has an Ingress Protection 54 (IP54) rating, which means that components are resistant to debris and to splashing water from any direction up to a volume of 10 liters per minute. The spindle and anvil have flat measuring faces and are carbide-tipped for wear resistance. The micrometer’s knurled ratchet thimble mechanism helps provide uniform pressure during adjustment for precise, repeatable measurement for precise, repeatable measurement. A spindle lock helps provide secure locking of the measurement position. Each micrometer includes, and is powered by, a single SR44 silver oxide battery. Micrometers are precision measuring instruments that use a calibrated screw to measure small 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.Standard Gage manufactures precision measuring equipment and metrology hand tools, and is a product line by Hexagon Metrology. Standard Gage is headquartered in North Kingstown, RI.