These Teledyne Hastings Digital VT thermocouple vacuum gauge controllers are matched for the DV-6 thermocouple vacuum gauge tubes (Stock Number 55-288DV6, Operates on 115 VAC). They measure pressure between the range of 0.001 and 1 Torr (1 to 1000 mTorr). The Teledyne Hastings Digital VT thermocouple controllers are self-contained instruments that offer extreme versatility for most vacuum applications. The electronic design assures long life and minimal maintenance. Compact Digital VT Models are ready for mounting onto a panel. Teledyne Hasting thermocouple tubes are also available but sold separately.