• Outside micrometer with a 0 to 3" measuring range and flat anvil/spindle pair for general purpose measuring, set of three.
• Vernier scale has 0.0001" graduation interval for precise readings.
• Hardened and precision-ground anvil and spindle have 0.256" diameter micro-lapped carbide measuring faces with 0.00005" parallelism on 0 to 1" micrometers and 0.00003" flatness for accurate measurements.
• Friction-style with ratchet stop applies constant force for repeatability between users and is suitable for one-handed operation.
• Insulated frame helps reduce temperature-related expansion or contraction and isolates heat from the operator's hand.

Fowler 52-229 series outside Vernier-scale micrometers have a choice of measuring range and a flat anvil/spindle pair for general purpose measuring. The Vernier scale has 0.0001" microfine graduation intervals on a satin chrome finish for precise readings. The positive locking nut on the spindle locks measurements in place for accurate readings and the zero adjustment on the sleeve ensures accurate measurements. The anvil/spindle pair have 0.256" diameter hardened, precision-ground, and micro-lapped carbide measuring faces with 0.00003" flatness and 0.00005" parallelism on 0 to 1" micrometers to provide accurate measurements. Friction thimble with ratchet stop applies constant force for repeatability between users. Friction-style thimbles are suitable for one-handed operation and stop turning when the spindle comes into contact with the workpiece, providing constant force for consistent measurements between operators. The ratchet-stop thimble can be used independent of the friction thimble. It provides an audible sound and stops the spindle from turning when the spindle comes into contact with the workpiece, providing constant force for consistent measurements between operators. The heat-insulated frame helps reduce temperature-related expansion or contraction, providing accurate measurements, and protects the operator's hands from heat. The set includes 0 to 1", 1 to 2", and 2 to 3" micrometers, 1" and 2" standards, a wrench, and a fitted case. Specifications Display type Vernier scale Anvil/spindle style Flat Measuring range 0 to 3" Graduation interval 0.0001" Thimble style Friction with ratchet stop Anvil/spindle diameter 0.256" Flatness 0.00003" Parallelism 0.00005" on 0 to 1" micrometers 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. The Fred V. Fowler Company 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. What’s in the Box? ------------------ * Fowler 52-229-201 0 to 1" outside inch micrometer * Fowler 52-229-202 1 to 2" outside inch micrometer and standard * Fowler 52-229-203 2 to 3" outside inch micrometer and standard * Wrench * Fitted case