Rangefinder will not pick up targets past 80 yards

The Ultimate Bushnell Scout DX Rangefinder
The Bushnell Scout 1000 is a pocket-sized laser rangefinder that offers a 5 - 1000-yard range with a +/- 1-yard precision in 3 diverse targeting modes: Scan, Bullseye, and Brush. The Bushnell Scout DX Rangefinder provides compact and lightweight design along with high-quality visuals to its 5 by 24-millimeter multi-coated optics.
It comes with a hard construction, water resistance, diopter adjustment, roll-down eyecup, a handy tripod mount, and features the ARC method with built-in inclinometer so you can get accurate distance on downhill or uphill shots.
Bushnell claims it will range a deep target at 1,000-yards, trees to 650-yards and a deer at 325-yards. It has a 6x21mm monocular for inspecting and aiming, weight 13.6 ounces and takes up 5.5 x 5 x 3-inches of space. There are a Cardura case, neck strap, and CR2 battery contained in the box along with a cloth to clear the instructions and clean the lens.
The ABS case has adequate non-slip surfaces to help users grip it securely, and there is a tripod hole if you want to have it in a stable position for some time. At this stage of our Bushnell Scout DX Rangefinder review, we will talk about the design of the rangefinder.
The Scout DX 1000 is a smooth and compact equipment that shares a similarity to the high-end G-Force 13000-series from the identical manufacturer. In addition, the best range finder has rubber armoring which provide a smooth and certain grip even when things get wet.
In fact, the Scout is fully water and fog proof which has a massive advantage out in the field. The Scout DX Rangefinder also has a flexible tripod mount that is placed into the bottom of the rangefinder.

Sig Kilo 2000 Rangefinder
Sig is famous for its high-quality product, and Sig Sauer 2000 Kilos Rangefinder is no different. This rangefinder is being picked by most of the hunters and shooters for its 1000+ yard range which enables you to have the best hunting experience. But that is not all. The Sig kilo 2000 rangefinder review describes more about it.
The Sig Sauer Rangefinder consists of a Cordoba protective carrying case, a lanyard, battery, a manual for guidance and a box for protection. The size of the rangefinder is possibly same as the size of your palm which is very convenient to use. The specifications of this rangefinder are as follows:
Specifications

• Magnification Range: 7x
• Finish: Matte black w/Rubber
• Objective: 25mm
• Eye Relief: 0.59" (15mm)
• FOV: 34.6' @100 yards
• Max Range: 3400 yards on Reflective targets1500 yards on trees1200 yards on deers
• Reticle: Circle with data
• Battery: CR2

Simmons Laser LRF 600 Rangefinder

Treestand bowhunters are known to be the people with particularly discerning preferences when it comes to shooting. If you are one of them, you surely are proud to make an accurate hit at extreme angle.
So, you know how important the difference of a few yards between the true horizontal distance and line of sight distance is when a successful hit is the only thing you want. Well, forget all these subtleties because Simmons Laser Rangefinder LRF 600 is there to help.
Alongside the reticle and battery level indicator, this budget-friendly rangefinder might seem a compromising model due to having no rifle, or bow, or target priority icons. After all, this model is ideal for shooters and hunters.
Important Highlights

• Accuracy: +/- 1 yard
• Range: 10-600 yards
• Monocular Optical System with a fixed focus
• 4x magnification
• Liquid crystal display
• Line of sight measurement
• Tilt Intelligence (For displaying True Horizontal Distance)

Sig Kilo 2000 Rangefinder

Sig is famous for its high-quality product, and Sig Sauer 2000 Kilos Rangefinder is no different. This rangefinder is being picked by most of the hunters and shooters for its 1000+ yard range which enables you to have the best hunting experience. But that is not all. The sig kilo 2000 rangefinder review describes more about it.
The Sig Sauer Rangefinder consists of a Cordoba protective carrying case, a lanyard, battery, a manual for guidance and a box for protection. The size of the rangefinder is possibly same as the size of your palm which is very convenient to use. The specifications of this rangefinder are as follows:

Specifications

• Magnification Range: 7x
• Finish: Matte black w/Rubber
• Objective: 25mm
• Eye Relief: 0.59" (15mm)
• FOV: 34.6' @100 yards
• Max Range: 3400 yards on Reflective targets
• 1500 yards on trees
• 1200 yards on deers
• Reticle: Circle with data
• Battery: CR2

Bushnell Scout DX Rangefinder is a good one for golf.
It's a fantastic rangefinder.
It offers some amazing feature and specification like...

• 6x magnification.
• Range between 5-1000 yards.
• 3-volt CR2 Battery.
• Rangefinder Accuracy 5 yards.

The Bushnell Scout DX Rangefinder will help you to pick from 3 different user modes by pressing the Mode button at the left side of the unit. First is the usual mode which can be used for most purposes up to 1000 meters and works well towards the pretty reflective surface.
When turned on, the Scout 1000 Laser Rangefinder liquid crystal display (LCD) will directly display icons like the bow and rifle mode. The bow mode will provide you with true horizontal distances from 5-99yd away, depending on the angle. The rifle mode, however, will permit you to get the angle and drop/holdover of your shot to the target from 100-800yd.

Page 5 of the manual states: RANGING ACCURACY The ranging accuracy of the Scout™1000 is plus or minus one yard / meter under most circumstances. The maximum range of the instrument depends on the reflectivity of the target. The maximum distance for most objects is 650 yards / 594 meters while for highly reflective objects the maximum is 1000 yards / 914 meters. Note: You will get both longer and shorter maximum distances depending on the reflective properties of the particular target and the environmental conditions at the time the distance of an object is being measured. The color, surface finish, size and shape of the target all affect reflectivity and range. The brighter the color, the longer the range. White is highly reflective, for example, and allows longer ranges than the color black, which is the least reflective color. A shiny finish provides more range than a dull one. A small target is more difficult to range than a larger target. The angle to the target also has an effect. Shooting to a target at a 90 degree angle (where the target surface is perpendicular to the flight path of the emitted energy pulses) provides good range while a steep angle on the other hand, provides limited ranging. In addition, lighting conditions (e.g. the amount of sunlight) will affect the ranging capabilities of the unit. The less light (e.g. overcast skies) the farther the unit's maximum range will be. Conversely, very sunny days will decrease the unit's maximum range.

The difference you are experiencing (20-19.2=.8 yards) is within the device ranging accuracy of 1 yard, and is in fact an error of only 4%. That is pretty accurate

In case you have lost your manual, you can download from here:
http://bushnell.com/getmedia/1761b4a2-f4d9-45f7-b1d3-1e400fead84a/REVISE-20-1932-20-19426LIM.pdf?ext=.pdf

Good luck with your device.

To aquire a target, the beam must bounce back to the unit. If you're out of square, even 1°, your beam will be missing the rangefinder by over 1 foot.

There is a ring below the eyepiece that is the focus......
Dont drop it and keep away from vibration. This will keep it in alignment. You will notice that if its been dropped it won't lock in on targets greater than 150 yards. A lot of players put the rangefinder in the compartment in the golf cart and the unit bounces around a lot. This practice just DECREASES the effective range. Alignment will be needed ($$)

mtg

You need an alignment. The transmitter and receiver are not pointing at the same spot. The farther the distance the bigger the gap between the two. Dropping the rangefinder and vibration are killers to Pinseekers. Bushnell will fix ya.....

First, make sure you are using alkaline batteries only. Heavy duty batteries don't generate enough current for the laser to operate properly. (pg4-para2 of the manual) If the rangefinder hits targets 120 yards or less and doesn't hit targets farther....the unit needs an alignment. Send it in to bushnell, they will repair it.