Accuracy² - Acoustic measurement device

The ONEOF® Accuracy² is a small yet robust acoustic measurement device designed for testing the accuracy of mechanical watches, and can easily fit in your pocket.

Mastering Time. The Swiss Watch Industry's Obsession with Precision

In the Swiss watch industry, accuracy is a fundamental characteristic of mechanical watches. Whether you’re a watch manufacturer or a watchmaker, timing is an all-consuming obsession. Fighting over only a few seconds per day is perceived as the ultimate quest for the biggest brands, while for others, it is a necessary politeness. This obsession with accuracy has been key to driving the entire watch industry forward.

Accuracy 2 mechanical watches accuracy measuring tool

The first-ever tool for Watch Lovers.

With the ONEOF® Accuracy², you can bring the art of watchmaking into your own hands and take care of your timepiece just like a professional. This groundbreaking tool provides the ultimate experience in precision and craftsmanship, allowing you to explore the intricate inner workings of your watch and unlock the secrets of its timeless beauty. Whether you’re a watch enthusiast or a seasoned collector, this tool is a must-have addition to your collection. With its innovative design and unparalleled functionality, it is the perfect way to take your passion for watches to the next level.

Unleash Your Inner Watchmaker. Take Control Like a Pro

Connected to your iPhone, iPad or PC, the ONEOF® Accuracy apps provide you with all the knowledge and expertise of the world’s most skilled watchmakers, right at your fingertips. With their intuitive interfaces and powerful features, these apps are the ultimate tools for anyone who wants to explore the art of horology in depth. Whether you’re a watch collector, an enthusiast, or simply someone who appreciates the beauty of precision timekeeping, these apps are an essential part of your toolkit.

Accuracy 2 mechanical watch accuracy measuring device

Specifications

  • Sensitive piezoelectric sensor
  • High-precision temperature compensated quartz oscillator TCXO
  • Accuracy +/- 0.5s/d accuracy
  • Dark grey anodized unibody aluminium casing
  • Soft-touch pad
  • Dimensions: 40 x 40 x 8mm (W x L x H)
  • USB-C connector, cable and adapters included
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 USB with high-frequency TCXO master clock.
  • Cross-platform USB plug-and-play (Windows, iOS).
Features
  • Automatic or manual gain control.
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 15 and later.
  • SQL Server required for Network/Cloud database.
Housing
  • Anthracite anodized aluminum body.
  • Soft-touch pad.
Other
  • Interface: USB type-C.
  • USB cable Type-C to Type-A included.
  • Apple Lightning to USB Type-A adapter included.
  • Dimensions: 40mm x 40mm x 8mm (W x L x H).
  • Weight: 20g.
Datasheets
iOS app User Guide
Windows app
Glossary

Connect with our team

Our experts are ready to connect and assist you.

Contact
TWS: A NEW EDITION IN THE CAPITAL OF WATCHMAKING KNOW-HOW
News
TWS: A NEW EDITION IN THE CAPITAL OF WATCHMAKING KNOW-HOW
EPHJ 2022: INNOVATIONS AND TAILOR-MADE SERVICES!
News
EPHJ 2022: INNOVATIONS AND TAILOR-MADE SERVICES!
H2i Wins EPHJ 2020 Exhibitors Grand Prix
News
H2i Wins EPHJ 2020 Exhibitors Grand Prix
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.