Ultrasonic Bolting System - Max II


Max II Ultrasonic Bolting System - The Qualitest Ultrasonics MAX II Bolt Tension Monitor uses ultrasonic transit time technology to measure the elongation, load, stress and percent strain of a fastener under tension. The MAX II incorporates many of the features found on other bolt tension monitors from Qualitest Ultrasonics with some added benefits in terms of features, hardware, speed, and length.

The Qualitest Ultrasonics MAX II Bolt Tension Monitor very accurately measures fasteners up to 100 feet in length. The measurement is achieved by determining the change in the transit time of an ultrasonic shock wave along the length of the fastener, as the fastener is tightened by any mechanical method. MAX II then interprets this time measurement into a given quantity of time (nanoseconds), elongation, load, stress, or strain while applying a load on the fastener. Using a variety of processing and automation, the MAX II reduces operator error. With built in data recordation and supporting DakView utility software for Windows PC & MAC OSX, the MAX II offers an easy to use and reliable solution to accommodate the most difficult bolting applications.


  • Quantities - Elongation, Load, Stress, Strain and Time (nanoseconds)
  • Sunlight readable color QVGA display (320x240 pixels)
  • Measure Modes - Pulse-Echo, Echo- Echo, Echo-Echo-Verify (triple echo)
  • Auto Correlation - Transducer Placement
  • Custom auto calibration feature
  • 4GB internal & up to 64GB external SD memory
  • USB 1.1 connectivity
  • Analog, serial & alarm outputs
  • PC interface reporting software
  • Import & export files - between Max II and MiniMax
  • Li-Ion pack & 6 AA emergency battery backup option
  • 2 year warranty



0.0492 to .5510 in/µs (1250–13995 m/s)

Measurement Modes

Pulse-Echo (P-E), Echo-Echo (E-E), or Echo-Echo-Echo (E-EV)

Measurement Range

1 to 999.999in (2540cm) in pulse-echo(P-E) measurement mode. Range will vary using multi-echo modes - dependent on material type and consistency


Zero Crossing


+/- 0.00001 in (0.0001 mm)


Automatic, Fixed, Single or TwoPoint zero calibration options


Blanview sunlight readable QVGA TFT color display (320 x 240 pixels). Viewable area 4.54 x 3.40 in (115.2 x 86.4 mm), or 5.7 in (144.78 mm) diagonal. 16 color pallete, multiple color options and variable brightness

Screen Refresh Rate



Precision TCXO timing with single shot 100 MHz 8 bit ultra low power digitizer

Pulser Voltage

100 - 400v


0 to 110dB with 0.2dB resolution. Manual and AGC control


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

Amplifier Linearity

+/- 1 dB

Amplitude Measurement

0 to 100% FSH, with 1% resolution


0 - 999.999in (25,400mm) at steel velocity

Power Connector

12v @ 2amps, adapter 100-240 VAC, .7 Amps, 50-60 Hz


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.


4.5 lbs (2.04 kgs), with batteries


8.5W x 6.5H x 2.5D in (216 x 165 x 70mm).

Operating Temperature

14 to 140F (-10C to 60C).


For more information about Ultrasonic Bolting System - Max II, please call us at 1.877.884.8378 or Click the button below.