MRFG is the app where we have stated the complete and through guide to rangefinder like how to use it , its types and how it works etc. Like The main operation of an optical rangefinder relies on the principle of coincidence or stereoscopic rang finding. In case of coincidence rangefinders, images of target are reflected back to you (the viewer) from two different sources .

This app is provided by https://myrangespy.com/ in free.