6" CARBON FIBER COMPOSITE DIGITAL CALIPERS Material is made of durable Carbon Fiber Composite Injected Material. Light weight, durable and accurate. Slides easily for better control and more accuracy when measuring. Features a 0" - 6" total width, with a digital read out in both SAE and MM units. Measurement accuracy read to the 100th decimal place (0.0001). Comes with 1pc button cell battery.