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The Mitutoyo outside micrometers series 103 features either 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 103-135 provides uniform pressure on a workpiece for precise, repeatable measurements. The friction thimble models allow for constant-force measurement for single handed operation.