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270 4 1/ 2 digit handheld digital oscilloscope with multimeter 2 channel 70MHz bandwith Storage Digital oscilloscope
The two channels of the oscilloscope are non-isolated channels. Note that the channel should use a common reference when measuring, and the ground wires of the two probes cannot be connected to two non-isolated places with different DC electrical levels, otherwise it may cause a short circuit due to the ground wire connection of the oscilloscope probe.