We have an old school one that we bought when we first got into duct cleaning. It was supposed to be used to keep you from hitting the A coil. Never use it and its more awkward to use, it only has an eye piece. We also have a Milwaukee one that works better and has a larger display and you can see better but the cable is short and manipulating the camera is still not as good as this toggle looks to be.
This one looks interesting. I don't think I want to demo it though. I'm afraid I might want it and buy it, then I'll have one more thing that rarely gets used.
