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The Probe-Scope is an open source 60MHz 250Msps oscilloscope probe with all guts built right in, that plugs directly into your PC via USB

The Probe-Scope is a 60MHz Bandwidth, 250Msps Open Source oscilloscope, in the form factor of a cable; imagine you cut the BNC end off an oscilloscope probe, and replaced it with a USB port, thats the Probe-Scope. The Probe-Scope grows as you grow, giving you as many channels as you have USB ports, the probe scope is almost infinitely expandable to tens (or more!) of channels. We are targeting a 100$ Price point, making it competitive with a Rigol 1054Z, and other low-cost oscilloscopes ($400 for 4 channels).”

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