The Mitutoyo outside micrometer series 103 features a ratchet stop or friction thimble that applies constant measuring force on a workpiece for exact, repetitive readings. Available in metric and inches, the Mitutoyo outside micrometer is ideal for measuring metal and non-metal workpieces. A ratchet-stop mechanism on the 103-131 provides uniform pressure on a workpiece for precise, repeatable measurements. The friction thimble models allow for constant-force measurement for single-handed operation.