The probeholder is designed as an accessory and the main part of the "ClampMan Probe" (CLM-1050). It's already included in the "ClampMan Light Classic" (CLM-1001 and CLM-1002) and also part of the "ClampMan Midi Plus" Set (CLM-2001).
It's designed to carry nearly almost all probes on the market. A special feature is it's adjustable pressure of the carrying probe onto a clamped PCB.