Product Descriptions
Accuracy Motion acoustic measuring devices accuracy watch - side angle image
Accuracy Motion acoustic measuring devices - 45 degrees position
Accuracy Motion professional acoustic measuring devices for watchmakers - side angle image
The Accuracy Motion watch accuracy measuring tool - product image from above

Professional Acoustic Measurement Instrument

The ONEOF Accuracy Motion is a motorized multi-position acoustic measuring instrument for mechanical watches or movements dedicated to professional watchmakers.

Innovative Revolution

The ONEOF Accuracy Motion is a high precision motion control system that has revolutionized mechanical watch measurement. It offers more features than any other acoustic watch measurement device on the market.

  • Acoustic measurement
  • High precision TCXO
  • +/- 0.1 s/d accuracy
  • 360° x 90° zero-backlash positioning
  • Static and dynamic modes
  • Multi-speed motor control capabilities
  • Programable motion sequences
  • Black anodized aluminium casing
  • Soft-touch coating

Complete control, endless possibilities

Historically, watchmakers test and adjust the chronometric precision of mechanical movements using acoustic measuring devices in six static positions, two horizontal and four vertical, in order to compensate for the effect of Earth’s gravity on the regulating system.

Six static positions are no longer sufficient because it is simply not representative of the actual wear of a watch which evolves in a dynamic three-dimensional environment with complex and varied disturbances. The ONEOF® Accuracy Motion was developed from this observation and from our desire to offer watch brands a tool that is capable of doing more and doing it better by using the latest adapted technology.

ONEOF® uses OM10 open source movement 3d data


Cutting-edge technology

Pushing the technological limits of a product requires rethinking the classic engineering from the early stages of its development. By equipping the ONEOF® Accuracy Motion with direct control with an Inertial Measurement Unit and strain wave gears (better known as of Harmonic Drive®), the product is more similar to aerospace technology than to standard watchmaking industry technology.

32’400 dynamic orientations

The ONEOF® Accuracy Motion can be controlled without any backlash – not only in the six standard static positions, but degree by degree, in 32’400 different orientations (90° x 360°). In addition, it allows speed control ranging from one degree per second to more than fifteen rotations per minute.

These features offer new possibilities for manufacturers who will create new test and control processes as they see fit, thus promoting optimal chronometric quality of their watches before they are put on the market.

Continuous rotation mode – in the dynamic continuous rotation action mode, the speed can be controlled from as low as 1 degree per second to a fast fifteen rotations per minute. At a relatively low rotation speed, depending on the watch escapement sound power, the rate measurement in rotation remains possible. This feature is highly useful when measuring a tourbillon movement where counter-rotation equals to the tourbillon speed.  The rate measurement result is independent from the tourbillon cage balancing.

Accuracy Motion Cable Light

Experience a clear workspace

When using several measuring instruments side by side for production purposes, keeping a clear workspace can get very complicated. All ONEOF® devices work with a single USB cable and support the multi-device plug&play technology.

See How it Works for Yourself

Setup a demonstration with one of our sales representatives by filling in the form on the Demo page.

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All H2i products are designed, manufactured and assembled in Neuchâtel, Switzerland. We have always taken special care to provide both high performance and user-friendly interfaces. All our software is developed in-house with the latest native programming languages.



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