The unit is small, sturdy and well built. I am using this to pre-view box loads of slides before archiving digitally. I didnt want to spend a lot of money as I will probably not use this again after I am finished. The view of the slide is enlarged sufficient to determine whether it is worth scanning the slide to computer. I estimate the magification is approx 2x. I can recommend this product as a relatively cheap and reliable slide viewer.
Having recently inherited a large number of 35mm slides, I needed a small slide viewer to assess the need for transferring to CD/DVD. This little slide viewer is very well built - not at all flimsy - and is perfect for the job. I would highly recommend it for reviewing old slides.