The 8900C Peak Power Meter directly displays the peak RF pulses over a 100MHz to 18GHz frequency range. It's an economical analog meter calibrated in watts and dBm. The analog display with its large, easy-to-read scale makes it simple to measure (peak or null) pulsed power systems. The dynamic range is 20 dB (0 to +20 dBm) 4 ranges of 3, 10, 30, 100 mW full scale. It?s powered by 100 and 120 VAC +5, -10%, 48 to 66Hz and 360 to 440Hz; 220 and 240 VAC +5, -10%, 48 to 66Hz.