What are the brands of industrial handheld endoscopes?

Many, I'll say some relative to the front of the bar, imported: the United States Weylin, Germany Wesa, Japan Olympus. Domestic: Jia Ruixida, Huazhou, Heng Yu digital, micro-vision, etc., the specific choice can be considered from these aspects, such as budget, use of the environment, pipe diameter, pipe length, light source illuminance, pixels, system features, etc. to choose.