This is an EQUATOR™ Machine Autochange Rack (6 ports) #A-5504-0250. It is an EQUATOR™ machine replacement part.

The Equator is supplied with an auto change rack with six positions for the opportunity to automatically change tools while retaining full repeatability. The automatic stylus changing rack with six ports increases the versatility of your Equator in order to gauge complex parts with multiple tool tips. The Equator rack makes it possible to gauge different parts in sequence without the need for probe calibration between jobs.