A range finder is a device that measures distance from the observer to a target. Some devices use active methods to measure (such as sonar, laser, or radar). There are other devices that measure distance using trigonometry to determine distance. They usually use a set of known distances or target sizes to make the measurement.
The upper portion of the field presented to the left eye is used as a finder, the lower portion is occupied by the scale upon which the ranges are engraved.
The finder is a low-power telescope of large field, to the centre of which the objective is brought.
The range to lights may be ascertained by the use of the astigmatizer, an optical device by which a point of light is drawn out into a vertical streak.
Whether you prefer to call it a RangeFinder, a LaserRangeFinder or a Golf RangeFinder, one of these distance measuring devices will be great to carry with you.
Many birders who play golf will benefit by using a golf rangefinder both on the fairway, and to estimate the distance to that perched hawk when birding.
In the middle price range is the Bushnell line of Yardage Pro rangefinders, and several Newcon advanced LaserRangeFinder devices.
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