The AM73515MT8A is the USB 3.0 version of the 5MP Dino-Lite Edge Series microscope that has a magnification range of 700x- 900x with built-in axial lighting.Measurements can be performed in different units (inch/mil/mm/um) and types including straight lines, circles, angles, arches grids and more. AMR displays the current magnification on screen with the included software for Windows or Mac OS. Through the use of Flexible LED Control (FLC) using the included software, this model is capable of switching between (or mixing) brightfield and darkfield illumination, revealing details that are very difficult to see under normal light.