I purchased this 9mm head as an upgrade to an inspection camera sold through Harbor Freight, which came with the typical 12mm head. (Either these cameras follow some connector standard, or most are manufactured by the same company. I've seen a number of brands that use compatible camera heads.)
The image quality with this 9mm head was disappointing. While the 9mm size does allow it to fit into smaller spaces, you are more apt to be left scratching your head wondering what it is you are looking at. I get a much clearer picture from the 12mm head that came with my camera.
It may, however, be a quality issue. The first inspection camera I tried showed everything out of focus. I returned it for an identical unit which worked fine. It's possible that trying a few more of these 9mm heads might turn up one that works better. Hard to say. I'm considering returning it.
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22-10574 - Replacement AC Adapter For Use With 22-10570
Replacement AC adapter
For use with 22-10570
22-10575 - 38" Extension shaft for 22-10570 Wireless Scope
38" shaft extension for 22-10570 scope Connect up to four extensions for 189" total shaft length
MCM Cat 57, Page 902
MCM Cat 56, Page 864
I am very pleased with both the products and the services. Thank you.