Since an image is worth a 1000 words these 2 images should help you decide whether a Gen 2 device will suffice or if you need to spend a bit more and invest in a Gen 3 model. The shorter the distance you need to see, the less likely you will need a Gen 3 model unless the best very best image quality is essential
EXPORT RESTRICTIONS: Products shown herein are subject to US export regulations and may require a
license prior to export. Any diversion contrary to US Government
regulations is prohibited.
EXPORT RESTRICTIONS: Products shown herein are subject to US export regulations and may require a license prior to export. Any diversion contrary to US Government regulations is prohibited