supply of low angle perspex wedgelow angle perspex wedge,low angle perspex wedge attachment for normal single crystal probe 20 deg, size: 20 mm dia. for usfd machine. make: modsonic, note: - the supplied parts should be of modsonic make only to maintain compatibility with modsonic make usfd machine. [ warranty period: 3 months after the date of delivery ] ] , low angle perspex wedge attachment for normal single crystal probe 22.5 de g, size: 20mm dia. for usfd machine. make: modsonic, note: - the supplied parts should be of modsoni c make only to maintain compatibility with modsonic make usfd machine. [ warranty period: 3 month s after the date of delivery ] ] , normal single crystal probe 2.5 mhz, crystal size: 20 mm dia, for usfd machine, mak e: modsonic, note: - the supplied parts should be of modsonic make only to maintain compatibility with modsonic make usfd machine. [ warranty period: 3 months after the date of delivery ] ]