The 435A Power Meter is an analog power meter, compatible with the entire series of HP 8480 Power Sensors. Depending on which sensor is used, the HP 43511 can measure power from -65 dBm to +44 dBm, full scale, at frequencies from 100 kHz to 50 GHz. This versatile instrument also features <1% instrumentation uncertainty, Iow noise and drift, auto-zero, recorder output, optional battery operation, and long cable options up to 61 m (200 ft).