Accuracy Pro - Acoustic Measurement Device

The ONEOF® Accuracy Pro is a high-end multi-position acoustic sensor for the measurement of mechanical watches. This device opened up a new era of innovation in the field of watch measuring instruments.

Breakthrough Technology Inside

As for all our professional acoustic measuring instruments, the electronic board of the ONEOF® Accuracy Pro is based on the premium XMOS micro-controller, a flawless hi-res USB audio processor.


  • Sensitive piezoelectric sensor
  • Automatic Gain Control
  • 1ppm precision TCXO
  • Cross-platform technology
accuracy_pro_movement_closeup_45_45

Built to Last

The ONEOF® Accuracy Pro is made entirely in a high-grade anodized aluminum alloy. All sensitive elements potentially in contact with the external parts of the watch are coated with a soft-touch rubber.


  • Aluminium unibody
  • Soft-touch coatings
  • Sleek design

ONEOF® uses OM10 open source movement 3D data

Position Tracking

Linked with an Inertial Measurement Unit – a MEMS component that combines an accelerometer and a gyroscope – the device delivers real-time data about both the orientation of the watch and the signal of its escapement.

  • Integrated IMU
  • Zero-blacklash positioning
  • Realtime position feedback

 

H2i Application Screen

New Intuitive Interface

The Accuracy Pro comes with a newly developed Windows App which integrates all the features you need: realtime scope view, diagram display, dispersion over time, cumulated graphs, tabular and radar chart all in an intuitive and user-friendly interface.

 

Specifications

  • Manual multiposition
  • 45° zero-backlash positioning
  • Smart locking System
  • Heavy watch locking system
  • USB-C plug & play
  • Anodized aluminum body
  • Sensitive piezoelectric sensor
  • Automatic gain control
  • 1ppm precision temperature compensated quartz oscillator (TCXO)
  • Integrated IMU with a 1° orientation detection
  • Cross-platform technology (Windows, iOS, macOS)
Rate accuracy
  • Range: ±1000s/d.
  • Resolution: 0.1s/d.
  • Precision: ±0.1s/d.
Amplitude
  • Range: 70 to 360°.
  • Resolution: 1°.
  • Precision: ±1°.
  • Lift angle: 10 to 90°.
Beat error
  • Range: 0 to 10ms.
  • Resolution: 0.1ms.
  • Precision: ±0.1ms.
Frequency
  • Automatic detection of common beating frequencies: 7’200 to 72’000b/h.
  • Manual entry of any other custom values.
  • Swiss and co-axial anchor escapements.
Parameters
  • Integration time: 2s to 240s.
  • Stabilization time: 0s to 60s.
  • Measurement time: ∞.
Processor
  • Audio Class 2 Asynchronous USB with high-frequency TCXO master clock.
  • Cross-platform USB plug-and-play (Windows, iOS).
Features
  • Automatic or manual gain control.
  • Automatic recognition of 20 test positions.
  • Integrated 3-axis Inertial Measurement Unit.
Features
  • Multi-sensor management for parallel measurements (Windows only).
  • Programmable sequences toolkit.
  • Local/Network/Cloud database for results and parameters.
  • Export measurement data as PDF and CSV files.
OS requirements
  • Windows 10, release 1803 and later.
  • iOS 14 and later.
  • SQL Server required for Network/Cloud database (Windows only).
Housing
  • Black anodized aluminum body with soft-touch coatings.
  • Zero-backlash 45° positioning.
  • Smart rubber holder for heavy watches.
Other
  • Interface: USB type-C.
  • USB cable Type-C to Type-A included.
  • Dimensions: 120mm x 140mm x 170mm (W x H x D).
  • Weight: 960g.
Datasheets
User Guide iOS app
Windows app
Glossary

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At H2i, we take pride in crafting high-end products for the Swiss-made watch industry. Our products are meticulously designed, manufactured, and assembled in Neuchâtel, Switzerland, where we ensure that every detail meets our uncompromising standards of quality and precision.