Probably, assuming it doesn't take other signals like power from the scope. The major difference is that a scope's input is 1Mohm, and most DMM's are 10Mohm. But since it behaves like a voltage source, a higher impedance should be fine. The output has probably the same waveform as the input (limited by the bandwidth), so there's nothing true-RMS about it, the conversion to DC is done by the DMM.