An apparatus for monitoring and measuring analog signal levels, current and reflected power (SWR) in an electric utility substation environment. The apparatus includes selective measurement capabilities for at least five individual frequencies, respectively, and includes programmable event recording and remote alarms. The apparatus will provide data to support in-band spectral analysis of recorded events, and can be located at any point along an associated communication path. The apparatus is non-intrusive and will not affect any existing signals present on an associated communication path.