If you just want to see the general shape of the waveform this looks kinda cool. I wouldn't use it for serious work but checking for clipping in an audio amp or watching your fuel injector pulses are within it capabilities. And $117.99 ain't a bad price.
http://www.pc-oscilloscopes.com/40_42.htm
Google for "USB oscilloscope" or "parallel port oscilloscope" for more ideas.
Michael
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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120
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