Digital Vernier Specifics: Professional tool for commercial or occasional use Precision made Vernier Caliper -Features a large LCD Screen for easy use. -Carbon fibre construction so lightweight to use but till strong enough to last -Suitable for both internal and external sizes. -Also can measure hole / thread depth with the built in depth stop. -Simple way to make accurate measurements of internal and external distances up to 150mm -Includes depth measuring tool -Can display in metric or SAE (imperial sizes) -Measuring range 0 - 150mm / 0 - 6" -Accuracy plus or minus 0.02mm (0 - 100mm) range and plus or minus 0.03mm (100mm plus range) -Accuracy is also effected in areas of very high humidity (over 80%) Bore Gauge Specifics: Chrome-plated steel. Locking knurled handles and automatically self-centring plungers with constant spring tension for uniform contact pressure Quick inside measuring of cylinder or hole bore by transferring dimension for external measurement. Indirect measurement by outside micrometer Includes: A: 8 - 12.7mm (5/16" - 1/2") B: 12.7 - 19mm (1/2" - 3/4") C: 19 - 32mm (3/4" - 1-1/4") D: 32 - 54mm (1-1/4" - 2-1/8") E: 54 - 90mm (2-1/8" - 3-1/2") F: 90 - 150mm (3-1/2" - 6") Chrome plated Range: 8 - 150mm 150mm gauges