Hi Clyde, I haven't seen any hand-held scopes that have cathode ray tubes for a few years now. How about one with an LCD screen? :-) I've had a Tektronix THS720 since 1995 and it's been great. The input channels are isolated from each other and everything else, there's a serial port and separate DMM input. It's a little large, but it's been great. There are a couple of new models now. Expensive, but you get what you pay for. See a screen shot from mine at: http://www.bobblick.com/bob/projects/ths720/index.html I bought mine from Print Products International here in the U.S. They discount Tek and/or make bundle deals which is fairly rare for Tektronix products. Don't know about any Tek dealers in .au. -Bob