GBI Upgrades

In the 1990s the NPL-Tesa Automatic Gauge Block Interferometer (AGI) was the instrument that set much of the World’s measurement standards. Now NPL – Hexagon have introduced the GBI300, an improved version of the AGI, resulting from continued developments at NPL. If you have one of the 20 or more NPL-Tesa AGI’s, you can now get an upgrade to the full GBI300 specification. 



  • GBI300 performance and facilities, including: 
  • FLaP for Windows™ software 
  • Phase stepping optical system 
  • Improved measurement of Flatness and Variation in Length
  • Improved ease of use