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Dennis' suggestion of using add and invert mode on the oscilloscope
works well depending on how much sensitivity you need.

If you have a 7000 mainframe, then a 7A13 combined with standard x1
probes may be acceptable. Standard x10 probes have the problem of not
having matched attenuation which spoils the common mode rejection.

Another alternative I have occasionally used is to build the probe
into the circuit using a fast instrumentation or difference amplifier.