This is the REVO® SFH-2 Module Holder #A-5764-0081.

The SFH holder fits onto the SFP2 probe via a kinematic magnetic joint.  It carries the required surface finish module using a manually adjustable knuckle joint. The holder can be stored in the MRS or MRS2 rack either fitted to an SFP2 probe (in an RCP TC-3 port) or separately in an RCP2 port. In both cases they will have a surface finish module attached whilst in the rack.

There are two holders available; SFH-1 and SFH-2.  The SFH-2 is 50 mm longer than SFH-1 and may need to be used for accessing certain features.