The F-70 measures high power pulse currents such as those associated with EMP waveshapes. It clamps around large conductors or bundles of wire and has an aperture of 69.85 mm. It has a usable frequency range of 1 kHz to 100 MHz. Its transfer impedance is typically 1W (± 2 dB) from 50 kHz to 100 MHz. It operates without saturation from 350 amperes of DC to 400 Hz, 100 amps of pulse current and 3 amperes of CW.