bus429, you're not trying to be internet spelling police and failing are you?
Borescope and boroscope are both acceptabe spelling for the tool we speak of.
I can't think of another reason for your random post.
Have a look
Boroscope.co.uk - Borescopes, inspection borescopes, provision borescopes, flexible borescopes, rigid borescopes, bore inspection equipment, fibre optic borescope