"Smart rangefinders" are rangefinders that correctly account for all ballistic variables and deliver an accurate solution to the shooter. "Basic" rangefinders are units that either don't provide any ballistic  correction or correct only for the angle of a shot by calculating horizontal distance.

BR4 Rangefinder https://www.revicoptics.com/br4balli...
Free Revic Ops Ballistic App https://www.revicoptics.com/app

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