Jut used mine this morning to look at a 1873 Trapdoor Springfield I just bought as a project..Bore is pristine as I was told and the Teslongs work really great..Great product for the money...
I use my at Home on a Computer..I suppose they make stuff to go in a phone or something..But I do not have a cell phone, tech way beyond this guys ability's....Home use is all I need it for..