What is the function of the First/Last switch?

• A. It verifies range in conjunction with the LRF and first displays the nearest range.
• B. First displays the nearest range in the LRF beam path; last displays the furthest range.
• C. It cycles through different target designations.
• D. It toggles the LRF between meter and yard units.

Answer: (B)

The function of this switch is to control which laser range finder reading is shown from the beam path. When you set it to the first, the system displays the nearest range detected along the LRF beam. When you set it to the last, it displays the farthest range detected along that same path. This matters because the LRF can pick up multiple echoes from objects at different distances along the beam, so you can choose either the closest object or the farthest one to verify distance to the target or to confirm range beyond obstructions. It’s not about cycling through designations or changing units; it’s about selecting which range reading to display.