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Diameter Measurement Gages

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Need to check size of parts while on the lathe, grinder or other machine center? Diameter Measurement Gages accurately measure the diameter of large parts on-machine without needing to calibrate and sweep with a beam gage.

The precision ground hardened steel wheel provides both accuracy and durability while riding on an uninterrupted OD surface of your part.  Using your machine center to rotate the part the gage calculates the diameter by averaging four full rotations. A proximity sensor and trigger with LED indicator for alignment combine to precisely count off each revolution of the part.  A digital touchscreen is built into the portable control box for the operator’s interface and to display the measurement results.DMG360_Large

Common machine tool receiver mount options are available to use the DMG360 wheel assembly in a variety of machines. It does not have to be dedicated to only one machine in your shop! Adjusters are built into the wheel body to allow you to easily align the wheel to the part, and a reference guide to apply the proper amount of pressure to preload the measurement wheel.

Optional handheld IR thermal sensors are available so you can enter the room temperature as well as the part temperature to use the system’s built in compensation factor.

Diameter Measurement Gages – Product Specifications


DMG360 On Machine

For on-machine diameter measurement of large turned parts using the machine centers rotational axis.


As with any distance measuring device, accuracy is directly affected by variations in the surrounding temperature.  The DMG360 software allows you to compensate for temperature changes when combined with optional thermal sensors.

System accuracy: 0.001″ (25.4 µm).


  • Various standard machine tool holder receiver mounts (Aloris, C5 Capto,…)
  • Handheld IR thermal sensors
  • Replacement proximity sensors and triggers


  • DMG360: includes encoder wheel unit, portable controller with touchscreen interface and color display, proximity sensor with flexible arm and electromagnetic base, trigger with mag base, cables and connectors in a high impact carry case.

For more detailed specifications download a datasheet for our on-machine Diameter Measurement Gage Model DMG360 DATASHEET

Contact ABTech for other sizes and gage types that can be configured to meet your exact requirements.

As with all of our products, Diameter Measurement Gages and proprietary display software are designed, manufactured, assembled and tested exclusively by ABTech at our Swanzey, New Hampshire facility. Every gage reflects ABTech’s high quality standards and exemplifies our company-wide commitment to “Pride in Precision” craftsmanship.