The Circuit uses a laser to create a tiny hole of 0.3 mm (0.01 in) in the shell of all fertilized hatching eggs. A minimal amount of allantoic fluid is then extracted from the hatching eggs and placed into an external marker.

From https://www.respeggt.com/technology/. According to their own site, they are a for-profit organisation incorporated in Köln, are focused on humane poultry and appear to have invented this technology.