measuring line noise

Is there any product other then the Audioprism noise sniffer that measure line noise. Thanks
An osciloscope?
Greg: Nice to find a trace of you, even if it is only on an osciloscope.....( am back for a friend with a few questions .....then I'll hit the road again , after doing a few repairs on my Unimog.)
A line viewer connected to an oscilloscope, that is.