Restricted and Open Gauging Tapes provide a convenient and accurate means for measuring ullage, product temperature and the oil-water interface. The units are configured to operate in the trimode, bimode, interface or temperature mode. Each instrument is designed to maximize ease of use. A single penetration of each tank can provide comprehensive data about internal tank conditions. When the electronic probe senses hydrocarbon, a steady tone is heard; when sensing water, it emits an intermittent tone. Temperature is shown on an LED display in the hub of the instrument.



  • of Tape: +/- 1/8″ (+/- 3mm), +/- 0.01% of F.S. tape LGT (F.S. = Full Scale).
  • of Temperature Display: +/- 0.5° F (+/- 0.2° C) +/- 1 digit error.
  • of Calibration Range: 32° F (0° C) to 176° F (88° C).
  • of Probe: For dryness to within 3/8 inch (10mm) of bottom.

Ambient Temperature Limits

  • LCD: same as above.
  • Sensor: same as above.


  • Open gauging (“O” type) (Safe product vapors only).
  • Restricted gauging (“R” type) via MMC vapor-control valve.

Battery: 9-Volt Duracell MN1604.
Operation: U-Ullage, I-Interface (oil/water), T-Temperature.

MMC Restricted and Open Gauging Tapes

MMC Gauging Tapes