Mitutoyo offers a complete selection of Bore Gauges. The 511 series bore gauges come standard with interchangeable anvils and necessary accessories to perform close tolerance ID measurements. Mitutoyo dial bore gauges are offed in metric and inch. Each Mitutoyo dials bore gauge is offered in two different graduations as well as an option with no indicator in which the user can use an electronic indicator as an option. Extensions are readily available for most models for those who need to take more measurements a little deeper into your workpieces.