If target range cannot be obtained:

Make sure LCD is illuminated.

Make sure that the power button is being depressed (as opposed to mode button).

Make sure that nothing, such as your hand or finger, is blocking the objective lenses (lenses closest to the target) that emit and receive the laser pulses.

Make sure unit is held steady while depressing power button.

Make sure that the targeting mode selected is the appropriate mode for that specific situation or environment. SCAN and >150 modes have different minimum distance and sensitivity to a specific target’s reflectivity levels.

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Bushnell 20-3031, 20-3131 instruction manual