I concur with Melanie and Ioannis. The Parallax scope does what it does reasonably well but what it does is extremely limited. I keep an old PC running W98SE just so I can continue to use my Protek 220 oscilloscope card which requires an ISA slot. The Protek 220 is no longer available but, when it was, sold for about $100. It's a shame that they have not made a PCI version.