An inside micrometer, also known as an internal micrometer, is a precision instrument for measuring the inside dimension of an object, such as the diameter of a hole or the width of a groove. A micrometer caliper with the points turned outward for measuring the internal dimensions of an object.

• Wide range of ID measurements with interchangeable rods.
• Each interchangeable rod is marked with its measuring range.
• The sizes of interchangeable rods can be adjusted with spacing collars.
• Both micrometer head and furnished rods are satin-chrome finished throughout.