amazon boroscop
I bought one of those cheap boroscopes that works off the wifi on the phone. The scope has this miniture mirror that screws on and is supposed to be able to see the valves. It has a rechargable battery that operates the little light at the end. I guess if you like gadgets and saving a nickle is your thing, then this little guy is the ticket.
For me, I like to have dedicated equipment and is made for a job. My differential compression tester has its own case and is only used for aircraft engines. I like that. Easy to find, easy to use, and works when i need it. This little boroscope will sometimes go off line, the battery will run down, the mirror sucks, and the optics plus my bifocals make me dizzy. Maybe I'm getting old and set in my ways but I don't want another device that relies on wifi or an Iphone or a rechargeable battery. I'd like to have a dedicated boroscope that was designed from the getgo to look insides cylinders and also be able to do hot sections if needed.
It'll probably cost me an arm and a leg but I guess I'm spoiled. I love good high quality tools that work when I need them without any fuss. The boroscope I got belongs in a dentist office, colonoscopy room, or behind a wall on a cruise ship (another story). It dont belong in my toolbox or in one of my cylinders. MY .02 worth.