Here you get the best deal possible.
But tricky to learn how to use it watched YouTube rather than instructions.
Unfortunately, the area of observation covered by the tiny lens is much too small for me.
Works well for my needs in the field, outdoors. You should get one, too.
I found it disappointing, far too hard to use accurately, having to bend over and to hold my eye close to the tiny prism was impossible to maintain.
I had high hopes as I design for metal laser cutting, tried to use this device a number of times but gave up due to the poor quality of the image. Yes, I know it says play with the lighting on both subject and drawing, I did, just frustrated, put it back in the bag and there it stays... novelty value only.
Thanks for the feedback, Adam! Feel free to reach out to us at firstname.lastname@example.org if you need anything else!