A rangefinder 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); others, available since the nineteenth century, measure distance using trigonometry. They usually use a set of known distances or target sizes to make the measurement.

See also

• Stadia (method)
• Laser range-finder
• Rangefinder camera

External link

• Infrared Rangefinding Tutorial for Robotics

Firearm sights

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