tender for rt probestation with accessories , main item , rt probestation with accessories , optional items , one (1) additional probe model 170 rf head gsg 100um pitch nickel alloy or tungsten tip , one (1) additional multi contact wedge dc to 40ghz gssggssg 100um pitch nickel alloy or tungsten tip , one (1) additional dc multi contact wedge with 75um pitch 12 pin nickel alloy or tungsten tip. each tip with a 1m long 22awg wire to male banana plug. , one (1) additional high frequency calibration substrate for use with rf heads 110-170 ghz g-s-g head with pitch = 100um (quantity=1) , one (1) additional high frequency calibration substrate for use with rf heads dc-40 ghz g-s-s-g head with pitch = 100um (quantity=1) , one (1) additional high frequency calibration substrate for use with rf heads 110 ghz g-s-g head with pitch = 100um (quantity=1)