The HP / Agilent 435B RF Power Meter is an analog power meter, compatible with the entire series of HP / Agilent 848(X) power sensors. Depending on which sensor is used, the 435B can measure power from -65 dBm to +44 dBm, full scale, at frequencies from 100 kHz to 110 GHz. This versatile instrument also features <1 percent instrumentation uncertainty, low noise and drift, auto-zero, recorder output, optional battery operation, and long cable options up to 61 m (200 ft). Additional Features: Optional battery for fully portable operation, Accurate internal calibration source for long-term accuracy, Nine interchangeable sensors for a wide range of applications. The HP / Agilent 435B RF Power Meter is an analog power meter, compatible with the entire series of HP / Agilent 848(X) power sensors. Depending on which sensor is used, the 435B can measure power from -65 dBm to +44 dBm, full scale, at frequencies from 100 kHz to 110 GHz. This versatile instrument also features <1 percent instrumentation uncertainty, low noise and drift, auto-zero, recorder output, optional battery operation, and long cable options up to 61 m (200 ft). Additional Features: Optional battery for fully portable operation, Accurate internal calibration source for long-term accuracy, Nine interchangeable sensors for a wide range of applications.