The USB microscope can magnify items from 10x magnification to 200x magnification. The picture is displayed on your PC monitor. Videos as well as pictures can be recorded for future observation. The device has a ruler function where precise dimensions can be defined using your mouse. Once defined, you can select any two points to get an accurate measurement across those two points. Aeromax is a Taiwan based company and you can see more here: http://www.aeromax.com.tw/