The Fowler-Bowers Bluetooth XTD3 Digital Internal Micrometers have been designed to further simplify the accurate measurement of bores. All XT instruments offer fixed anvils. Sizes above 1"/25mm offer extended travel. They are available as individual instruments or in complete sets. • Larger easy-to-read display • Direct inch/metric conversion • 4 Preset memories • Ratchet stop for consistent measurement • Resolution: 0.00005"/0.001mm • Proximity and USB connectivity • Heads with special anvils available for threads, splines, slots, etc. • Setting rings included in all sets • Includes UKAS certificates for micrometer, heads and setting rings • Special anvils available Bluetooth Electronic Holemike XTD3 - Individual sizes (includes head, handle and ring)