The only reference I could find was to the TPR which is a Pirani gauge with a range of 5x10-4 mb to 100 mb. This comes from http://www.pfeiffer-vacuum.com/compgauges.html
This page does have a picture of the various sensor tubes so you can probably make a match. If you have readout/sensor/cable, connect them and see if you get a reading under vacuum.
Pfeiffer's Web page is pretty poor IMHO. Same for Balzers. (Pfeiffer split off from Balzers a few years ago in the US).
Steve
Created on Thursday, March 15, 2001 8:30 PM EDT by Steve Hansen