Velleman Handheld Oscilloscope $107 at Microcenter
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The HPS140MK2 handheld oscilloscope still holds the same power as its predecessor, the HPS140, but in a new and modern design. Although small in size, this oscilloscope packs 40 MS/s in real time and its sensitivity can go as low as 0.1 mV. It also has a full automatic measuring system but can be operated manually if preferred.