Lab gear that fits in a jacket pocket is usually a toy, and the DSO152 is the exception: 200kHz of bandwidth and 2.5MS/s of sampling on a 2.8-inch screen, with a one-key AUTO that settles the trace for you. It runs about four hours on its 1000mAh cell and charges over USB-C, which makes it as useful for tracing a sensor signal in a car as for learning waveforms on a bench. It is the number two best seller in Amazon's lab oscilloscope category, which says more about the price than the marketing does. Buy it if you want a scope you will actually carry; skip it if you need four channels or 100MHz of bandwidth.
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