Mitutoyo 293-345 Digital Outside Micrometer, Inch/Metric, Ratchet Thimble, 1-2" (25.4-50.8mm) Range, 0.00005" (0.001mm) Resolution, +/-0.00005" Accuracy, Meets IP65 Specifications Micrometer measures 1.0 to 2.0" (25.4 to 50.8mm) with 0.00005" (0.001mm) resolution and + or - 0.00005" accuracy, for taking outside diameter measurements in harsh workshop conditions LCD screen displays in inches and metric units Plastic components are oil-resistant and measuring faces are carbide-tipped for durability Ratchet thimble to help provide uniform pressure for precise, repeatable measurements Ingress Protection certified IP65 for protection against dust and water