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 325B (220 to 325 GHz）
Model 500B (325 to 500 GHz)
Model 1100B (750 to 1100 GHz)
Model 7 and Model 7A(dc to 500 Mhz, 50 ohm)
Model 12C(dc to 500 Mhz, 1 Megohm/0.1pF)
Model 18C and 19C(dc to 350 Mhz, 10 femtoamps/0.02pF)
Model 18C and model 19C(dc to 350 Mhz, 10 femtoamps/0.02pF)
Model 34A (dc to 3GHz)(dc to 3.0 GHz, 10 Megohm/0.1pF)
Model 28 and 29(dc to 1 Ghz, 10 femtoamps/0.04pF)
