Stand alone screen makes it a great borescope. The fact that this unit has its own screen with built in picture and video recording capabilities is awesome. I had previously tried a different model that you had to connect to your phone, and the experience using the phone app was not very good. This model has solved all of the problems with the user interface by having buttons and a screen to operate the unit.

I happened upon the Teslong Boresighter while I was shopping for something similar. The pix shown on the Amazon page looked very clear. The price for this bore sighter is very fair I so decided to give it a try. The product is even better than I expected. The imagines on the included monitor are amazing. There is so more detail and clarity displayed than I thought possible.

I am still trying to figure out whether this is the best thing I ever bought or the worst. The image quality is great, it runs forever on a charge, the box it comes in is fantastic for storage and its very durable with appropriate care. You can video or take still shots to compare or post. The problem is you can not claim ignorance anymore.