These small scope are very attractive, because of their price and their size. The problem is that it is totally unsuited to troubleshooting pinball machines.
Since the late 70's, the pinball machines are built with CPU-based electronic boards. Which usually work with clocks of more than 1 Mhz. The bandwidth of this kind of scope does not exceed 200 Khz ... With that, you can not even control if the clock of your CPU works properly !!!
It's just good for measuring audio signals, but certainly not for testing CPU boards.
