Standard Pack = 1 piece(s). Type = Trimos Mini-Horizontal System ; Internal Measurements = 0.24 - 4 Inch ; External Measurements = 0 - 4 Inch ; External Measuring Range = Increased By Displacing The End Stock ; Internal Measuring Range = Increased By Displacing The Measuring Inserts ; Accuracy = Within 0.00006 Inch ; Resolution = Using Display Unit D50S No. 54-618-148, The Resolution Is 0.0001 Inch Or 0.00001 Inch ; Mini-Horizontal Construction = Monoblock Construction With Probe Guide Track, Adjustable End-Stop With Anvil Location, Control Knob For The Displacement Of The Guide Track Of The Monoblock (Probe Release), Adjustable Measuring Pressure Device, Location For Different Measuring Features, I.E. Electronic Probes Or Indicators, 8Mm Diameter, Interchangeable Measuring Anvils For External Measurements (53-190-019 Anvils