The professional-level Celestron LCD Digital Microscope II is a biological LCD microscope at an affordable price. The microscope even includes a 1GB SD card, enough storage to capture over 600 high-resolution images for lab reports, papers, lesson, and more.
The stage tends to creep down a little, making it out of focus. I have to use a rubber wedge under the stage main knob to stop it from moving. It is obvious that microscope lacks a locking system.