Standard Pack = 1 piece(s). Type = Electronic Height Gage ; Measuring Range = 28 Inch /710 MM ; Range With Probe Inverted = 40 Inch /1028 MM ; Maximum Permissible Errors = 2.5 + L( MM ) / 1000 ; Frontal Squareness Deviation = 0.00032 Inch /0.008 MM ; Resolution = 0.00001 Inch /0.0001 MM ; Repeatability (2s) = 0.00002 Inch /0.0005 MM ; Measuring Force = 0.75 / 1.5 N ; Battery Life = 12 Hours; Interfaces = USB / RS232 ; Air Cushion = Yes ; Squareness Probe = Yes ; Feature = Extremely Easy To Use, High Contrast Display Allows Easy Reading At Any Time With User Friendly Functions, Cast Iron Base For Optimal Stability, Dual Probe Holders, Carriage Displacement Manual, Accessory Measuring Probes Up to 340 MM In Length Available And Provide Excellent Repeatability ; Models Include = Charging Unit, Measuring Insert With Ruby Ball 4 MM , Probe Holder Elbow 8 MM , Setting Gage, User's Manual ;