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One basic type is the optical range finder modeled after a ranging device developed by the Scottish firm of Barr and Stroud in the 1880s. Once you enter your high and low notes the famous singer vocal range closest to your own will appear. Halo Xr700 8 700 Yard Laser Range Finder Vortex Optics Finder Rangefinder Progressive Electronic Berlin School. Music rangefinder . Bozily Golf Rangefinder with Slope 6X Rechargeable Laser Range Finder with Charging Cord 1200 Yards Flag-Lock Slope ONOff Continuous Scan Support - Tournament Legal Golf Rangefinder. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators. The number after the name can either be the 1500 or 1800 which simply stands for the maximum effective range of the unit. Music profile for Rangefinder. Range finder any of several instruments used to measure the distance from the instrument to a selected point or obj...