Fowler Electronic Deep Throat Micrometer Features Include... 0-1" / 25mm Measuring Range 0.00005" / 0.001mm Resolution + 0.00016" / 0.004mm Accuracy 11.875" Deep Throat Carbide Measuring Faces Ball Anvil Flat Spindle Enamel finish frame. Ratchet Stop. Spindle Lock For sheet metal and similar applications Inch/Metric absolute and relative measuring conversion Spindle diameter: 0.256" Furnished in fitted case