Each input channel can be used to make a "floating" measurement with an independent signal reference level. The disadvantages of the dual trace oscilloscope are that it cannot switch quickly between the traces and it cannot capture two fast transient events. One source  states that there is a noticeable effect on the accuracy of voltage measurements at only 20 percent of the stated bandwidth. These include controls for the delayed-sweep timebase , which is calibrated, and often also variable.
Oscilloscope Current Probe
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