Tektronix AFG31101 Function Generator & Counter, 100MHz Max, FM Modulation, Maximum Frequency Range (Square, Pulse and Arbitrary Waveform): 80MHz, Minimum Frequency Range (Square, Pulse and Arbitrary Waveform): 1 μHz, Maximum Frequency Range (Triangle/Saw): 1MHz, Minimum Frequency Range (Triangle/Saw): 1µHz, Digital Frequency: Yes, Dimensions: 412.8 x 143.3 x 191.8mm, Frequency Range (Square, Pulse and Arbitrary Waveform): 1 μHz → 80 MHz (Square, Pulse), 1 mHz → 50 MHz (Arbitrary Waveform), Input Impedance: 10 kΩ, Length: 412.8mm