the world's most advanced ultrasonic bolt elongation measurement instrument


As the latest evolution of the first devices developed for the NASA space program over 30 years ago, the mmx-II is at the pinnacle of today's ultrasonic bolt elongation measurement technology. Operating seamlessly with the existing min-mmx devices or independently, the mmx-II with its large full-colour display is an integral component of an effective bolted joint reliability program, either in the field or on a production floor.



Max II Specification


  • Weight: 2.04 kg (4.5 lbs), with batteries
  • Size: 216 x 165 x 70 mm (8.5 x 6.5 x 2.5 in)
  • Operating Temperature: -10C to 60C
  • Keyboard: Membrane switch with 21 tactile keys
  • Case: Extruded aluminium body with nickel plated aluminium end caps (gasket sealed)
  • Display Views: RF (full wave view), +/- Rectified (half wave view), Digits, or Split Screen combination (wave plus large digits)
  • Environmental: Meets IP65 requirements


  • USB: Direct USB 1.1 PC connectivity
  • Power Connector: 12v @ 2amps, adapter 100-240 VAC, .7 Amps, 50-60 Hz
  • 5 Pin Lemo includes:
    - RS232 Output Two independent alarm outputs triggered by the gates.
    - Analog Out Proportional outputs (amplitude or distance), 0-10 volts.
  • Transducer Connectors: Two LEMO 00 connectors


  • Log Formats: Grid (Alpha Numeric)
  • Capacity: 4 GB internal & up to 64 GB External SD slot
  • Screen Capture: Tagged interface file (.tif ) capture for quick documentation
  • Custom Setups: 64 user configurations

Power Source

  • Lithium Ion Pack: 10.8v, 2 amp hrs, typical operation 18hrs
  • Battery Backup: Emergency battery backup. Six 1.5V alkaline, 1.2V AA Nicad cells, 1.2V AA NI-MH, or other other equivalent power source
  • Battery life (continuous use): Alkaline (12 hrs), NiCad (5hrs), and NI-MH (12hrs), with default settings


  • Display: Sunlight readable QVGA TFT colour display (320 x 240 pixels). Viewable area 115.2 x 86.4 mm (4.54 x 3.40 in), or 144.78 mm (5.7 in) diagonal. 16 colour palette, multiple colour options and variable brightness
  • Screen Refresh Rate: 60Hz
  • Timing: Precision TCXO timing with single shot 100 MHz 8 bit ultra low power digitiser
  • Pulser Types: Spike, Square Wave & Tone Burst
  • Pulser Voltage: 100-400v
  • Pulse Width: Selectable step options Spike, Thin, Wide, HV Spike, HV Thin, HV Wide, TB .5MHz, TB 1MHz, TB 2MHz, TB 5MHz, TB 10 MHz. Spike 40 ns, Square Wave 80 to 400 ns, Tone Burst 50 ns to 1 microsecond
  • Gain: 0 to 110dB with 0.2dB resolution. Manual and AGC control
  • Damping: 50, 75, 100, 300, 600, & 1500 ohms
  • Frequency Band: Broadband 1.8 - 19 MHz (-3dB) filter
  • Horizontal Linearity: +/- 0.4% FSW
  • Vertical Linearity: +/- 1% FSH
  • Amplifer Linearity: +/- 1 dB
  • Amplitude Measurement: 0 to 100% FSH, with 1% resolution
  • Delay: 0 - 25,400 mm (999.999 in ) at steel velocity.
  • Measurement Gates: Three independent gates depending on measurement mode selected, with audible and visual alarms Amplitude 5-95%, 1% steps


  • Setups: 64 custom user defined setups; factory setups can also be edited by the user
  • Auto Set: Automates the detection, scope, and display setting process for each bolt
  • Gates: Three measurement gates, depending on measurement mode used, with adjustable start and threshold
  • Alarm Limits: Adjustable Hi/Lo tolerances with visual LEDs & audible sound. Hardware alarm outputs with optional accessory cable
  • Field Calibration: Vector or Regression correction using Load & Stress.


  • Units: Metric (mm), Imperial (in), or Time (μs)
  • Velocity: 1250–13995 m/s (0.0492 to .5510 in/μs)
  • Measurement Modes: Pulse-Echo (P-E), Echo-Echo (E-E), or Echo-Echo-Echo (E-EV)
  • Measurement Range: 1 to 2540 cm (999.999 in) in pulse-echo(P-E) measurement mode. Range will vary using multi-echo modes (dependent on material type and consistency)
  • Detection: Zero Crossing
  • Resolution: +/- 0.0001 mm (0.00001 in)


  • Automatic, Fixed, Single or Two Point zero calibration options


  • Time - Nanoseconds
  • Elongation - Change in length (inches/millimetres)
  • Load - Force load applied (pounds KIP or megapascals MPa)
  • Stress - Force for unit area stress applied (inches per inch or millimetres per millimetre)
  • %Strain - Ratio of elongation to effective length

Bolt Materials

  • Selected from a preset or custom list


  • Transducer types: Single element - 1 MHz to 10 MHz frequencies, and various diameters. Magnetic & non-magnetic options available
  • Glue-On: Available for short bolts with minimal elongations
  • Connectors: Microdot, Lemo 00, or BNC options depending on the selected transducer
  • Custom Transducers: Available for special applications


  • Factory calibration traceable to NIST & MIL-STD-45662A


  • 2 year limited


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