Review on Enhanced Visibility with Porta-Trace Master 20x Opaque Projector by Scott Channell

Do not buy! The lens fell out the first time I used it. The lens barrel is very difficult to focus. The fan is too small. After 30 minutes of use, the plastic case started to melt! The bracket holding the lens barrel separates at the joints, allowing the lens barrel to fall out. Don't buy this thing, it doesn't work well, falls apart and is a fire hazard. I cannot understand how this product can be sold by anyone. Don't waste money.