The Mauser (it was formerly developed by Optik-Elektronic of Austria, but they were taken over by Mauser) teleranger sight is a specially compact laser rangefinder which can be attached to most types of optical or electro- optical sights to provide an instant and accurate range check (to within five metres at ranges between 70 and 2000 meters). Research Teleranger Sight
 
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Matt and Leela Probert