Leupold GX-3i3 User manual

OPERATING INSTRUCTIONS
GX
®
-3i
3
and GX-4i
3
RANGEFINDERS

Introduction..........................................................................................Page 1
About Leupold & Stevens, Inc. ..............................................................Page 2
Accuracy ..............................................................................................Page 4
How GX Rangefinders Work....................................................................Page 5
GX Rangefinder Specifications ...............................................................Page 8
Operation .............................................................................................Page 9
Cleaning/Maintenance ...........................................................................Page 33
Warranty/Repair.....................................................................................Page 34
TABLE OF CONTENTS

1
Congratulations! You have purchased a Leupold®GX Series digital laser rangefinder
that has been designed by Leupold’s engineers and designers to be the best
rangefinder in its class and to provide you with years of solid performance on the
course. Following are instructions detailing the proper use and employment of your
GX Series rangefinder. To ensure top performance for the life of the product, please
read these instructions before operating your GX-3i3or GX-4i3.
Your new Leupold GX Series digital laser rangefinder incorporates advanced digital
electronics with state-of-the-art ballistics algorithms. The Digitally eNhanced
AccuracyTM (DNA®) engine incorporates additional signal processing techniques to
generate better ranging distance with more accurate rangefinding. GX3features
include an incredibly bright OLED display and PinHunter 3 Laser Technology.
Another truly innovative and unique feature is True Golf RangeTM (TGR®), which is
available on the GX-4i3TGR model. TGR algorithms are a marriage of laser ranging,
an inclinometer, and an advanced computerized ballistics program. The result is
distance measurements accurate to less than a yard, no matter the angle at which
the laser is fired.
INTRODUCTION

2
ABOUT LEUPOLD & STEVENS, INC.
It’s a decidedly American story: in 1907, a young German immigrant named
Fred Leupold set up a one-man shop at 5th and Oak Streets in Portland, Oregon,
repairing optics for surveying equipment. The small company survived the First
World War and the Great Depression. But it was the Second World War that would
forever change the company. Working with the U.S. Army on a riflescope and the
Navy on optics for use aboard ships, the engineers at Leupold®learned the secrets
of waterproofing and durable construction that would completely change the world
of sports optics.
Leupold & Stevens, Inc. is still family-owned, though the focus has turned from
land surveying to helping people across the globe survey their environments with
innovative, high-performance optics and accessories. Leupold optics are renowned
for their unchallenged ruggedness, and their vastly superior optical quality. A cen-
tury of observation and optical experience has gone into every product we produce,
and we think the results are well worth the extra effort required to achieve this level
of quality.

3
In true American style, the philosophical foundation laid in our early years has served
us well as we’ve grown and changed over the decades. In fact, the firm’s founder
established the clarity of purpose that we see at Leupold & Stevens, Inc. today:
“We solemnly promise never to let down on quality, the customer is entitled to a
square deal.”
Markus Friederich “Fred” Leupold

4
The ranging accuracy of the GX3series of rangefinders is +/- .5 yard/meter. The maxi-
mum effective range depends upon a number of factors including lighting conditions
and air quality, but the most important factor is the reflectivity of the target. For most
objects, the maximum distance is 550 yards, while for highly reflective targets (such
as pin prisms), distances of 700 yards can be obtained.
ACCURACY
MAXIMUM RANGE
CONDITION GX-3i3GX-4i3
Reflective Target (yd/m) 700/640 700/640
Trees (yd/m) 550/502 550/502
Pin/Flag (yd/m) 450/411 450/411

5
The Leupold GX3series of 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
instantaneously by measuring the time it takes for each pulse to travel from the
GX3rangefinder to the object and back. Surface texture, color, size, and shape of
the target all affect reflectivity, which in turn affects the maximum range of the
instrument. As a rule of thumb, brightly colored targets are much more reflective
than darker targets, with black being the least reflective color. A shiny surface is
more reflective than a dull surface. Smaller targets are more difficult to range than
larger targets. Light conditions, haze, fog, rain, and other environmental conditions
can all affect ranging performance. Any factor which degrades air clarity will reduce
the maximum effective range. Bright light shining directly on the lenses reduces
the effectiveness, producing shorter maximum ranges than those possible on darker
(overcast) days. The steadier the GX3unit is held, the greater the maximum distance.
HOW IT WORKS

6
The Leupold GX
3
6x22mm rangefinders employ an eye safe FDA Class 1 laser in their
operation. Outside of the United States, the IEC is the governing body over laser
products and has classified the GX
3
rangefinders as Class 3R. Even so, there are a
few precautions that are important to remember:
• Do not depress the POWER button while aiming at a human eye or while
looking into the optics from the objective side
• Do not leave the GX
3
within the reach of small children
• Do not take the product apart as it has a self-protection device in the
electronic control module and may cause an electric shock
• Do not attempt to use any power source other than a CR2 battery (or
equivalent) — the GX
3
is designed to prohibit accessing any other external
power supply
SAFETY AND OPERATION PRECAUTIONS
CLASS 3R LASER PRODUCT INVISIBLE LASER RADIATION
AVOID DIRECT EYE EXPOSURE This product complies with IEC
60825-1: 2014-05 Ed. 3.0 and complies with FDA performance standards
for laser products except for deviations pursuant to Laser Notice
No. 50, dated June 24, 2007.
P
o
:<5.14mW. λ:895-915nm. t
W
:20-60ns.
LEUPOLD & STEVENS, Inc,
14400 NW Greenbrier Parkway, Beaverton, OR 97006

7
SAFETY AND OPERATION PRECAUTIONS (cont.)
• Read this instruction manual in its entirety before using this rangefinder. If the
product is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired
• Caution: Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure
• When you see the display through the eyepiece, please be aware that the
product is active and emitting an invisible laser and the laser aperture should
not be pointed toward anyone
(Display as seen through the eyepiece)
GX-4i3Display
(Smart Key on)
GX-4i3Display
(Smart Key off)
GX-3i3Display

8
SPECIFICATIONS
The GX3Series of digital laser rangefinders provides a variety of useful modes to
tailor performance to the conditions you experience in the field. Model features are
identified on the following pages.
GX-3i3GX-4i3
Magnification
6x 6x
Inclinometer
No Yes
TGR
®
(True Golf Range
™
)
No Yes
Club Selector
No Yes
3 Selectable Aiming Reticles
Yes Yes
Quick Set Menu
Yes Yes
Line of Sight Distance
Yes Yes
Yards/Meters
Yes Yes
Fog Mode
Yes Yes
Prism Lock
Yes Yes
One-Touch Scan Mode
Yes Yes
Battery Life >4000 Actuations >4000 Actuations
Weight
7. 8 o z 7.9 o z
Dimension (Inches) 3.8L x 3.0H x 1.4W 4.2L x 3.0H x 1.4W
Low Battery Indicator
Yes Yes
Warranty
2 Years 2 Years
Waterproof
Yes Yes

9
OPERATION
QUICK SET MENU™
*GX-4i3display shown with all possible characters visible

10
GX-3 i3 & GX-4 i3
BATTERY
POWER
MODE
FOCUS
The GX-3i3and GX-4i3have two buttons: POWER and MODE. When you initially
press the POWER button, the display is activated and the unit is ready for ranging.
Press the POWER button a second time to range, or hold down the POWER button
to scan. Scanning automatically updates the display. When ranging without a steady
rest at long distances, you can easily differentiate the pin from other potential
targets behind the pin.

11
When you press and hold the MODE button for 1 second and then release it, the
Quick Set Menu is activated. To set or activate a mode, you must advance to that
function by pressing the MODE button until that function is displayed. To activate
or manipulate a function, press the POWER button as necessary. If this is the last
function to be set, allowing the rangefinder to sit idle for 30 seconds will cause an
automatic power-off, saving all selections. If additional set up is required, simply
press MODE to continue through the Quick Set Menu.
Pressing and holding MODE for at least 2 seconds at any time will exit the Quick
Set Menu, save all previous changes, and prepare the rangefinder for immediate
use. To reset your GX-3i3or GX-4i3to factory settings, press POWER to activate
the unit. With the rangefinder activated, press and hold MODE, then immediately
press and hold POWER while continuing to hold MODE. After the 10-second timer
shown in the display reaches zero, the rangefinder will return to factory settings.

12
FUNCTION 1: FOG MODE
The Fog Mode can be used in foggy/rainy conditions
to screen out false readings from raindrops or other
atmospheric interference to provide an accurate range.
Fog Mode changes the algorithm to look for the “last”
target. To increase ranging accuracy always range the
ground around the pin/flag when Fog Mode is on.
TO ACTIVATE FOG MODE:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 1 second and then release to
enter the Quick Set Menu; the word “Fog” will now appear in the
upper display.
3) While the word “Fog” is displayed, press and release POWER as
necessary until the word “On” is displayed in the lower portion of
the display.

13
4) To save the changes and return to ranging mode, let the unit sit idle for
at least 30 seconds until an automatic power-down occurs, or simply press
and hold MODE for at least 2 seconds. To continue through the Quick Set
Menu and manipulate another feature, press and release MODE until the
appropriate icon is displayed.
NOTE: There is no icon for Fog Mode in normal operation. When powered on the unit
will display “Fog On” to remind you of the current setting. We recommend turning
Fog Mode off during normal ranging to enable easy location of the pin/flag.
SMART KEY TECHNOLOGY:
Available only on GX-4i3models, the yellow Smart Key provides True Golf Range
(TGR) and Club Selector capability. Replace the yellow Smart Key with the included
chrome faceplate to completely disarm TGR functionality and instantly convert the
GX-4i3to a device that measures distance only. Use of the GX-4i3for tournament
play is permitted when Local Rule is in effect (see USGA Decision 14-3/0.5). Safe
storage for the Smart Key or chrome faceplate can be found inside the carrying case.

14
FUNCTION 2: TRUE GOLF RANGE (TGR) (GX-4 i3 WITH SMART KEY
INSTALLED ONLY)
True Golf Range is an adjusted range that will
compensate for uphill shots that play long and downhill
shots that play short. TGR is calculated from the line-of-
sight distance, incline or decline, current temperature
and altitude, and will display the adjusted range the
golfer should play to. For example, if you have a lie 150
yards from the pin, but the green falls 6 degrees above
your ball, you should play the shot as if it were 164 yards.
150 yards line of sight
164 yards True Golf Range to pin

15
NOTE: Turning TGR off will also disable the Club Selector
and inclinometer display; all distance readings will be line-
of-sight measurements.
TO ACTIVATE TGR:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 1 second
and then release to enter the Quick Set Menu; press and release
MODE one more time to advance to TGR mode.
3) While TGR is shown in the upper portion of the display, press and
release POWER as necessary until “On” is shown in the lower
portion of the display.
4) To save the changes and return to ranging mode, let the unit sit idle
for at least 30 seconds until an automatic power-down occurs, or
simply press and hold MODE for at least 2 seconds. To continue
through the Quick Set Menu and manipulate another feature, press
and release MODE until the appropriate mode is displayed.

16
FUNCTION 3: DAY OF PLAY (dP) TEMPERATURE INPUT
(GX-4 i3 WITH SMART KEY INSTALLED ONLY)
Temperature is one of the factors used to determine TGR ranges;
inputting the current temperature will increase the accuracy of
your TGR measurement. The default temperature setting is 75
degrees F (25 degrees C).
NOTE: If yards is selected as the desired measurement output,
the temperature will automatically be measured in Fahrenheit. If
meters is selected, the temperature will be measured in Celsius.

17
MANUALLY INPUT THE DAY OF PLAY TEMPERATURE:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 1 second and release to enter the
Quick Set Menu.
3) Verify that TGR is turned on; if TGR is not activated, you will not be
able to enter the current temperature, see “To Activate TGR:” above.
4) Press and release MODE until temperature is displayed.
5) While the temperature is flashing, press and release POWER to
change the current temperature setting to match the current
conditions. Each depression of POWER will increase the temperature
setting by 5 degrees until 120 degrees F (50 degrees C) has been
reached, at which time the setting will return to 30 degrees F
(0 degrees C) and begin increasing again.
6) To save the changes and return to ranging mode, let the unit sit idle
for at least 30 seconds until an automatic power-down occurs, or
simply press and hold MODE for at least 2 seconds. To continue
through the Quick Set Menu and manipulate another feature, press
and release MODE until the appropriate icon is displayed.

18
FUNCTION 4: DAY OF PLAY (dP) ALTITUDE INPUT
(GX-4 i3 WITH SMART KEY INSTALLED ONLY)
Altitude is one of the factors used to determine
TGR ranges; inputting the local elevation/altitude will
increase the accuracy of your TGR measurement. The
default altitude setting is 1000 feet, and will be shown in
the lower portion of the display.
NOTE: Altitude is always measured in feet.
MANUALLY INPUT THE DAY OF PLAY ALTITUDE:
1) Press POWER to activate the rangefinder.
2) Press and hold MODE for at least 1 second and release to enter the
Quick Set Menu.
3) Verify that TGR is turned on; if TGR is not activated, you will not be
able to enter the current altitude, see “To Activate TGR:” above.
4) Press and release MODE until “Alt” is displayed.