A micrometer from Grainger is a professional instrument that can calibrate machinery interior and exterior surface measurements with amazing accuracy. Micrometers are useful calipers that are used by mechanical engineers to ensure that machinery designs are as precise as possible. Grainger has many specialized micrometers to choose from, many with their own unique features. Digital micrometers measure thickness quickly and have an LCD display for easy reading. An inside micrometer and outside micrometer calibrates interior and exterior tools and machinery surface dimensions in either inches or millimeters. Rely on Grainger for micrometers and all your precision tools and accessories.