I had some idea that products like the Extech Video Borescope existed, but as usual, I didn’t know where I might find one until Lab Safety dropped a note in my inbox. I find their missives helpful because they solve problems I didn’t even know I might have.
Note that this cool unit is not just a video screen on the end of an invasive probe, but it’s also a wireless video screen on the end of an invasive probe. Heck… it could eve be alien technology (since they seem to have cornered the zeitgeist on invasive probes). According to the product page at Lab Safety, the video screen can be used upto 32 meters from the probe unit. And it will record to your handy-dandy SD card. What more could you want in an invasive video probe?
I was just poking around one of my favourite tool retailers — Busy Bee Tools — and noticed that they also have a Video Borescope. Maybe not quite as capable as this one, but also probably not as expensive … http://www.busybeetools.com/products/VIDEO-BORESCOPE-INSPECTION-TOOLS-GENERAL.html