The best borescope would be one that fulfills all your current needs and in the near future.
The USA2000J-6-2000 offers High Definition resolution with joystick articulation. Some additional features are text annotation and app compatibility to easily send pictures from your phone.
The USA750J-4-1500 is the ergonomic version of the USA2000J with a smaller screen that does not compromise its high definition resolution.
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