Leupold RX-2800 TBR/W Complete Operating Instructions page 16

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FUNCTION 1: TBR OR LOS
To activate TBR or LOS, activate the RX-2800 TBR/W by pressing the POWER
button, then press and release the MODE button to enter the menu . While "Out
Put" is shown in the display, press and release the POWER button to rotate through
TBR and LOS modes . Once the desired mode is displayed, press the MODE button
for >1 second and release .
The inclinometer output is shown beside the battery status indicator .
TBR
M
LOS
TBR
TBR calculates the equivalent horizontal range (level fire range) from which you can
determine the correct aim for the conditions . For example, if you are shooting a .270
caliber, 130 grain bullet at 3,050 feet per second up a 30° incline at 400 yards,
direct line of sight, the TBR output will be 367 yards . The first step in correctly
using TBR is to Practice, Practice, Practice . Anytime you handle a firearm, you are
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ultimately responsible for your projectile .