All these PC/doodad 'scopes seem to be limited to 5V. I just checked my old Tek 465 ($80 on eBay) and not only does it do 5V PER DIVISION, thats where the knob was set. The last time I used it I needed a couple of separated, 0-15V traces. Can you really get by with such a limited vertical amplifier? Dan / WG4S / K2 #2456 <snip> I would probably go for a bitscope (www.bitscope.com) </snip>