These Alcatel FA 101 high vacuum cold cathode penning gauge controllers are precision instruments designed to indicate high vacuum pressures from 1x10-2 to 1x10-7 Torr. The Alcatel FA 101 high vacuum cold cathode penning gauge can operate and display pressure from one penning gauge. These Alcatel FA 101 high vacuum ion gauge controllers operate on either 115 or 220 VAC. Ion gauge cable and ion gauge tubes are available but sold separately.