AR891 na'urar auna nesa ita ce kayan aiki wanda ke amfani da laser don daidaitaccen auna nesa zuwa manufa. Laser rangefinder harba wani ƙaramin laser zuwa manufa a lokacin aiki, da photoelectric bangare karɓar manufa tunani da laser beam, timer auna lokacin da laser beam daga fitarwa zuwa karɓar, lissafin nesa daga mai lura zuwa manufa. Laser rangefinder yana da nauyi mai sauƙi, ƙananan girma, sauƙin aiki mai sauri da daidaito, kuskuren shi ne kawai kashi ɗaya cikin biyar zuwa kashi ɗaya cikin ɗari na sauran rangefinder gani, don haka ana amfani da shi sosai don auna ƙasa, auna filin yaƙi, tankuna, jiragen sama, jiragen ruwa da harbi don auna nisan manufa, auna girgije, jirgin sama, makamai masu linzami da tauraron dan adam da sauransu. Yana da muhimmiyar fasaha kayan aiki don inganta high tanks, jiragen sama, jiragen ruwa da harbi daidaito.