These quality digital indicators have SPC data output (RS-232, BCD, and MTI) and can easily be switched between inch and metric. The digital readout is to .0001" (0.002 mm) with an accuracy of ±.0001". Although battery operated (and the batteries are included), an AC adapter can be used. The face diameter is 2-1/4" and it can be rotated for sideways or upside-down viewing. They have an adjustable lug back and a 4-48 thread contact point. There is no stem for mounting. What you see in the photo is the movable spindle. You will have to mount these using the adjustable lug back. These models also feature preset and absolute measuring, reverse travel, minimum reading hold, freeze display, and tolerance preset (high and low). - Lithium CR2450N 3V battery (2 pieces) ... $17.50
Digital long range indicator made in USA with the SPI logo. The 4" model is shown to the right. | 
