It's unfailingly simple to operate: bring the unit to your eye and depress the button on top. A crosshair will appear in the middle of the field of view which you place over the object to be measured. Depress the button again and it will measure the distance to your target using:
...a state-of-the-art laser rangefinder capable of measuring the distance of a deer-sized animal from 6 yards to 550 yards, and a reflective target from 6 yards to 800 yards. The rangefinders emit a series of invisible, infrared energy pulses that are reflected off the selected target back to the optical unit. State-of-the-art circuitry and precision computing circuits are used to calculate the distance by measuring the time it takes for each pulse to travel from the RX-800i to the object and back.Folks, I gotta tell you, whatever electronic voodoo it uses, it freakin' works. The K-Yote is sighted in at 200 yards, and when I ranged a p-dog in the 200 yard range, it had a lifespan measured in milliseconds. Ambulance Driver had a ballistic calculator and was calculating holdovers for me based on the distance to the target as computed by the rangefinder. Using that information - and the supremely accurate MG Arms K-Yote - I was able to take down a prairie dog at nearly 400 yards.
For large or small game, especially in the open like prairie dogs, a rangefinder is a handy tool to have in the range bag. It's simple to operate, accurate, and offers 6X magnification - I was using the RX-800i as a rough spotting scope (it helped locate and determine that the giant black prairie dog was, in fact, a clod of dirt. Well, that and a few rounds through it...). I'm glad I had it with me on the shoot, and can certainly recommend it to any varmint hunter - or hunter in general - who needs to accurately calculate distance to target to make the perfect shot.
The Leupold RX-800i Compact Digital Rangefinder gets an enthusiastic endorsement.
That is all.