The B-G Carbon Fibre 100mm Digital Caliper/Vernier is a versatile tool for measuring internal and external dimensions, hole depths and thicknesses in both metric and imperial units to a resolution of 0.1mm/0.01”. The short 100mm (3.9”) scratch resistant carbon composite body makes measuring in tight spaces much easier than a conventional 150mm (6”) caliper, making it ideal for measuring brake disc/pad thicknesses or sizes of fittings in the engine bay. LR44 Battery is included.