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Bushnell Yardage Pro 400 Laser Rangefinder Instructions

by Gus Stephens

Bushnell's Yardage Pro 400 is a laser range-finding monocular. It blends a 5-times magnification scope with an LCD viewing screen; the device's illuminated reticle displays targeting, yard, meter and mode information. The Pro 400 is primarily designed for determining range on golf courses. It is also useful for hunting, boating and other outdoor activities. For most targets, the unit has a maximum measuring range of 400 yards. A target-quality bar graph on the LCD displays the relative reflectivity of the target in the scope's field of view; this predicts the accuracy of the range-finding result. An estimate of the plus and minus accuracy of the range figure is displayed after the measurement. The Yardage Pro 400 is powered by a single 9-volt alkaline battery. It weighs 18 oz.

Step 1

Look through the monocular. Press the "Fire" button on the top-right side of the unit to activate the LCD.

Step 2

Aim the unit at a target at least 21 yards away. Press the "Fire" button; hold the button down until the range reading is displayed. Release the button. The range is displayed for 30 seconds.

Step 3

Sight another target; press and hold the "Fire" button. The range of the previous target is cleared, and the range to the new target is displayed.

Step 4

Press and hold the "Mode" button on the lower-right side of the unit for five seconds. This causes the unit to toggle between yards and meters. The unit automatically changes from the present unit of measure to the optional unit of measure. It displays the new unit of measure on the LCD.

Step 5

Scan an area containing several targets -- or a target in motion -- by holding the "Fire" button for at least 10 seconds after the range is displayed. Range is continually updated as long as the "Fire" button is depressed.

Step 6

Observe the target-quality bar graph -- located at the top center of the LCD -- when targeting an object. The reflected laser pulses returning from the target create squares on the target-quality bar graph. A high reading on the graph indicates a more accurate range-measurement figure.

Look for the "Precision" indicator on the LCD after a range measurement appears. When "PRECISION" appears, the reflectivity of the target is sufficient to produce accuracy within 1 yard or meter. If "PRECISION" does not appear, the range-finding accuracy of the target is plus or minus 3 yards or meters.

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About the Author

Gus Stephens has written about aviation, automotive and home technology for 15 years. His articles have appeared in major print outlets such as "Popular Mechanics" and "Invention & Technology." Along the way, Gus earned a Bachelor of Arts in communications. If it flies, drives or just sits on your desk and blinks, he's probably fixed it.

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