Shimano 105 12speed B tension gauge (RD-R7150)

A gauge for the adjustment of the B-tension of a Shimano 105 Di2 rear derailleur. Suitable for the 105 series, not suitable for Ultegra or Dura Ace (use this model for Ultegra and Dura Ace: Link). Matches the measurements and guiding lines of the original (see photos).