It is very important to have a focusable feature when you want to see far and near. 

We have three diameter USB borescopes with built-in focus features:
  • 14.5mm diameter, FC-145300plus
  • 8mm diameter, FC-852plus
  • 3.9mm diameter, FC-3920plus
We also have some rigid and straight manual focus pen-type microscope borescopes, such as PM-40, PM-70, GB-430 and GB-460. All of them have manual focus feature. 
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The features and benefits of focusable borescopes:
  1. Can adjust focus, so one can see clearly within close-up or far away
  2. Magnification range is broad, from less than 1x to around 150x
  3. USB connection to a PC, Mac, Android devices
  4. Take pictures and videos
  5. Built-in LED lights for illumination in dark places