Reference Calibration Tubes (DB-20)

The Teledyne Hastings Instruments (THI) Reference Tube is an evacuated, sealed vacuum gauge tube accurately calibrated to precisely simulate a gauge tube at a given operating pressure. It is electrically equivalent to the metal and glass gauge tubes used with THI instruments. It permits quick and easy recalibration of THI Vacuum Gauge Indicators by merely plugging the instrument into the reference and adjusting the calibration “current set” potentiometer
until the instrument reads the exact pressure noted on the reference. THI Reference Tubes are available equivalent to most THI Gauge Tubes.

Technical Brochure



  • Instant Calibration Check
  • Recalibration of Hastings Gauges
  • Adjusts Gauge for Any Length Cable
  • Stable, Accurate, Rugged, and Reliable


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