Not always touchscreen controls. I got a good deal an an AN/USM-338 oscilloscope at the local surplus shop. It had a sticker on it "bright trace/no horizontal". And a low enough price to make fixing it worthwhile. Took it home, plugged it in and no horizontal drive. The function switches all had (somewhat) transparent rubber caps over them*. Upon close inspection, someone had poked the trigger control button, putting the scope in "single shot" trace mode. I set that to "free run" and now have a nice piece of test gear for a fraction of the EBay price.
*The caps serve to make the equipment somewhat splash proof. A few of the EBay listings actually describe this thing as a US Navy underwater oscilloscope. Nope.