The XT3 digital internal micrometers offer a larger and clearer LCD display - along with IP67 electronics protection, proximity output with optional built-in Bluetooth; both allow bi-directional communication giving greater flexibility for data acquisition and storage. The extended mechanical travel of the XT range means that special heads can also be manufactured to accommodate users most awkward measuring problems. Individual instruments supplied with digital display unit, head, ring and UKAS. Simple 2-button operation 4 preset memories Proximity RS232/USB output Tungsten carbide measuring faces on all 3-point heads from 12.5mm Blind bore measurement from 2mm - 6mm and above 12.5mm (0.500") Extensions available above 6mm for deep hole measurement Ratchet stop to ensure consistent measurement Serial number on all digital readouts and measuring heads Bore gauges manufactured according to DIN 863, part 4 Supplied in fitted wooden case Range: 2-300mm (0.080"-12") 3 point me