Logo Accuracy
Logo Swiss Made


Logo ONEOF white

Coming in early 2015

The first high-end diagnostic instrument for watches

Made for iPhone

Accuracy by ONEOF®.

Every sound counts.

For several years, we have been developing the most accurate and precise diagnostic instruments to fulfill the highest requirements of Swiss Watch Manufactures. Today, ONEOF® gives watch aficionados the opportunity to acquire the only high-end integrated tool capable of providing a complete diagnosis of a mechanical watch on an iPhone.

Swiss Made aluminium unibody.

It may be all about performance, but it has emotion.

Made of anodized 6000 series aluminium unibody, the sensor has been designed with the utmost care and every detail has been perfected in conjunction with the best Swiss watch suppliers. Compared to any other measurement instruments, the high-end finishing of the Accuracy sensor will definitely be consistent with your timepiece.

Sensor thickness
Sensor size
Sensor weight
Sensor Photo 1

Dragonfly technology.

Timing is our strength. Simply take care of your watch.

The code name DRF, for Diagnostic/Regulation/Frequency, used at the early stage of the project, has become the visual identity of the ONEOF® Accuracy product. The patent pending Dragonfly technology brings together all the advanced hardware & software skills of our experts. The result is an outstanding measurement precision of 0.00000232 (±0.1 s/d).

Sensor filaire
Sensor Photo 2

Accuracy App.


Just place the crown of your watch against the sensor and touch the dragonfly button. After only thirty seconds of initialization, you get all the detailed technical information about your watch in a fun and user-friendly app : beats per hour, instantaneous and average rate accuracy in seconds per day, amplitude of the balance wheel, beat error, signal analyzer as well as graph... You then have the possibility to save all the results in your watch’s database.

App Accuracy
Appli vibrographAppli graphAppli dataAppli settings

Accuracy App.


For the very first time, a watch measurement instrument allows you to share your results on social networks or send them by emails.

If your are interested in a pre-order, please contact us


Follow us

Facebook Twitter

Made for

iPhone 6

iPhone 6 Plus

iPhone 5s

iPhone 5c

iPhone 5

iPhone 4s

Accuracy by ONEOF®

Registered trademark.