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Fast and Accurate Verification and Diagnostics Device for Your Hamburg Wheel Tracker 

The InstroTek HWT-Pro is a comprehensive verification and diagnostic device for the Hamburg Wheel Tracker.  The HWT-Pro can measure and report your machines deviation from AASHTO T-324 calibration requirements.  The HWT-Pro also follows the recommendations of NCHRP Project 20-07 Task 361 conducted at Louisiana State University.  Wheel load, wheel position, wheel speed, waveform, rut depth and water temperature can all be measured with the HWT-Pro.  In addition, The HWT-Pro can detect the wheel’s position along the wheel path, its center point and measure both static and dynamic load.  The dynamic wheel load is compared to a true sinusoidal wave and the RMSE for the equipment is reported.  The HWT-Pro is the only device to give accurate and precise information about your Hamburg Wheel Tracker calibration.

HWT-Pro Spec PC Software

The HWT-Spec PC Software captures all data from the HTW-Pro.  The software leads the user through a series of steps collecting verification data along the way.  The HWT-Pro Load Sensor collects wheel load (static and dynamic), position, speed, and waveform through a USB cable while the HWT-Pro Height Indicator provides the tools to measure LVDT displacement data safely.  Three point displacement  is measured under the wheel for a more realistic displacement verification.  Finally, a NIST traceable temperature indicator is used to capture water temperature at any point along the wheel path.   The HWT-Pro Verification Report provides a pass/fail summary of the Hamburg’s conformity to AASHTO T324 and graphical comparison of the wheel movement to the sinusoid wave shape.


HWT-Pro Spec Verification Report 


 HWT-Pro Kit

The HWT-Pro consists of a carrying case, load and height verification devices, sample tray centering spacers for different model wheel trackers, NIST traceable temperature indicator, USB cable and HWT-Spec Software.  The device is made of precision machined stainless steel and quality electrical components. All measurement devices used in the HWT-Pro are NIST traceable and the unit is provided with certificate of calibration.

The Best Diagnostic Tool for Your Hamburg Wheel Tracker

The HWT-Pro is much more than a verification tool.   Equipment malfunction and non-conformance to calibration standards can often cause issues with test results. The Hamburg wheel tracker has many moving parts that can wear differently over time.  Long periods of non use before or after the construction season can cause systems to fall out of calibration.  The HWT-Pro allows you to verify all calibration parameters and identify issues with your Hamburg wheel tracker that may affect test results.  The HWT-Pro can track changes in performance overtime and provide information that user can use to identify parts that may need replacement over the lifetime of the equipment.


  • Verifies all AASHTO T-324 Measurement requirements
  • Meets recommendations of NCHRP Project 20-07 Task 361
  • Allows for easy and safe verification of the unit, without having to place hands and fingers close to the wheel and heavy loads
  • Measures wheel load, Wheel center point, waveform, displacement, and water temperature
  • Measures both static and dynamic wheel load
  • Checks accuracy of the wheel motion versus sinusoid and reports RMSE
  • Check calibration quality before a project or after long periods of nonuse
  • Quickly diagnose and trouble shoot issues with your equipment
  • HWT-Spec PC Software easily captures and reports verification results
  • HWP-Pro includes NIST traceability certificates


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