SPI Electronic Bore Gage 2 Point Measurement System with precision wheel guides for self-centering. Specifications include... 1.4" - 2.4" Measuring Range 0.00005" / 0.001mm Resolution 6" Probe Depth 6 Anvils 3 Spacers Features include... Close tolerance inspection of bores for size, roundness, ovality, and taper. Electronic indicator is fully protected by rugged cover to minimize potential shock in the machine shop environment. 2 point measurement with precision wheel guides for self centering. Various anvil sizes are provided in each set to achieve desired measurement range. Spacers also included for fine adjustments. Zero setting with plain ring gage or micrometer. Inc./abs/inch/metric measuring. Auto shut off. Furnished in fitted case