American Photonics Lens Kit Focal Gauge 10.5mm

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This is a focal length gauge for use with American Photonics lens kits. They preset their lenses so the focus point is 10.5mm from the end of the nozzle. This happens to be the diameter of a AAA battery. I created this simple gauge so if can be more easily used and less prone to rolling away as the battery does, ha. There is a recess allowing for the loop of an attached lanyard to not get in the way of allowing the gauge to lay flat along the surface.