Review on High-Definition 2MP USB Microscope: 40X to 1000X Magnification - Digital Camera for Inspection, Endoscope with Carrying Case - Compatible with Windows 7, 8, 10, Mac, Linux - OTG Android Phone Compatible by Jennifer Johnson

I was really impressed with how the zoom potentiometer clicked into place. This prevented accidental stripping and a corrupted image. The HD quality is really good. I think the only thing I didn't like was that it was very difficult to find one that actually worked among the apps I downloaded for the external camera. Plus, once you get it working, it works great. Very impressed with the quality.