These Pfeiffer IKR 251 Cold Cathode Gauges provide measurable vacuum pressure in the range 7.5x10-3 to 1.5x10-9 Torr. The vacuum pressure can be displayed via a DCU or TCP 350 turbopump controller or via the TPG 261, 262, or 256 Active Gauge controllers. They have a KF25 flange. They are metal sealed and are qualified for a high 150°C bakeout temperature. This pricing is for the Pfeiffer IKR 251 Gauge only. All Pfeiffer controllers and signal cables sold separately on this website. For complete operating instructions on the IKR 251 Cold Cathode Vacuum Gauge see the .pdf's at Downloads.