Easy keyboard control  Balanced frame design  Smooth friction thimble for uniform pressure  Automatic off after 30 minutes non-use  Measurement hold button  Micro-lapped carbide measuring faces  Ability to retain and return to the true zero reading  Zero tool at any position  No-glare finish  Hard, stable 1-piece spindle  Instant inch/millimeter conversion  Large, high-contrast LCD digital readout  Ring-type knurled lock nut  Standard inch graduations on shell and thimble  RS232C output jack.Restricted States:AK,HI,PR