Federal Dimensionair D-2500 Air Gauge Pneumatic Gage .00005" 2500:1 works Great. This is a Great working Gauge. I have it aired up and the gauges work, and move perfectly. The one Black Knob on-top has a very slight bend to its shaft (it still turns and works perfectly, so that is not a problem in any way) I'm an engine machinist, and I know what these are used for, It would be good for Quick accurate Lifter bore measuring and/or many other General Machine Shop Industry uses
Call ()952)854-5 seven eight six
P.S. I also have many of the Measuring Probes for sale on Ebay..Look for these key words on my Ebay Store ( seller Name dragar85 )
FEDERAL Air Plug Gauge measuring Probe