The T-Gage IV MM has the same specification as the T-Gage IV + but also includes a Multi-Mode key to instantly toggle between measuring mode I-E (to 1st back echo) and E-E (through paint thickness) to ignore surface coatings.

Technical Specification

  • Measuring range 0.63-500 mm in I-E mode
  • Measuring range 2.54-25.4 mm in E-Emode using a highly damped “Gamma” transducer.

T-Gage IVMMDL - data logger version available


The T-Gage IV MM is a simple to use hand-held Ultrasonic Thickness Gauge with the ability to measure through paint and coatings and eliminate the thickness of the paint or coating. The T-Gage IV MM uses a dual element style transducer. With the single press of a button, the T-Gage IV MM can be switched between pit or flaw mode ( pulse-echo), and through paint/coatings mode (echo-echo) for maximum inspection efficiency. The T-Gage IV MM is equipped with a bundle of features to make your job eaiser: Alarm mode, high speed scanning, and data send are the main features of the T-Gage IV MM. The T-Gage IV MM comes as a complete kit, ready to use, and is backed by Dakota Ultrasonics 5 year limited warranty.


  • Corrosion & Pitting
  • Tube & Pipe
  • Tanks Boilers
  • Glass
  • Variety of Applications


    1. Physical
      • Weight: 10 ounces
      • Size: 63.5 W 120.7 H x 31.8 D mm (2.5 W x 4.75 H x 1.25 D inches)
      • Operating Temperature: -30° to 50° C (-20° to 120° F)
      • Case: Extruded aluminum body / nickel plated aluminum end caps.
        Resistant to impact and environmentally sealed.
    1. Keypad
      • Sealed membrane that is resistant to both water and petroleum products.
      • Nine tactile-feedback keys.
    1. Transducer
      • Dual element (transmit and receive).
      • 1 to 10 MHz frequency range.
      • Special high damped transducers available for use with through paint or coating measurements).
      • Locking quick disconnect LEMO connectors.
      • 1.2m (4 foot) cable.
      • Optional cable lengths up to 100 feet.
      • Custom transducers available for special applications.
    1. Power Source
      • Two 1.5V alkaline or 1.2V NiCad AA cells
      • Typically operates for 200 hours on alkaline and 130 hours on NiCad.
      • Display flashes when battery is low. Unit turns off automatically when battery is too low to operate reliably.
    1. Display
      • Multi-function 4.5 digit liquid crystal display with 12.7mm (0.500 inch) numerals, backlit for use in poor light conditions.
      • Backlight is selectable: on / off / auto ( illuminates only when taking a measurement).
      • Measurements displayed in inches, inches/microsecond. millimeters, and mters/second.
      • Bar graph indicates stability of reading.
    1. Certification
      • Factory calibration traceable to national standards.
    1. Warranty
      • 5 year limited
    1. Measuring
      • Range:
        • Pulse Echo Mode(Pit & Flaw Detection): Measures from 0.63 to 500 millimeters (0.025 to 19.999 inches).
        • Echo Echo Mode (Thru Paint & Coatings): Measures from 2.54 to 25.4 millimeters (0.100 to 1.0 inches).
      • Switch to select English or metric units.
      • Resolution: 0.01 millimeters (0.001 inches)
      • Velocity Range: 1250 to 10,000 meters/sec (0.0492 to 0.3937 in/microsec).
      • Built in: Stainless steel reference disk for probe zeroing.
      • Four readings per second for single point measure ments or 16 per second in scan mode, captures the minimum thickness.
      • Single and Two point calibration option included.
    1. Features
    • Multi-Mode: Toggle between Pit/Flaw detection (Pulse Echo Mode), and through Paint/Coatings (Echo-Echo Mode) with the single press of a button.
    • Alarm Mode: Enter a minimum acceptable thickness value. If measurement falls below minimum, red led will illuminate and sound beeper. If measurement is above minimum value, green led will illuminate.
    • Data Ouput: RS232 output sends thickness readings to a computer or other external storage device.

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