Model 50 (33 - 50 GHz )

Model 50 (33 - 50 GHz / WR-22 waveguide input)

Model 120 (75 to 110 GHz )

Model 120 (75 to 110 GHz / WR-10 waveguide input)

Model 140(90 to 140 GHz / WR-8 waveguide input)

Model 140(90 to 140 GHz / WR-8 waveguide input)

Model 170 (110 to 170 GHz )

Model 170 (110 to 170 GHz / WR-6 waveguide input)

Model 220 (140 to 220 GHz / WR-5 waveguide input)

Model 220 (140 to 220 GHz / WR-5 waveguide input)

Model 325B (220 to 325 GHz）

Model 500B (325 to 500 GHz)

Model 1100B (750 to 1100 GHz)