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First, be sure and focus the eyepiece on what you desire to measure distance to. Begin the measurement with the range dial set to minimum. Slowly tury the dial until the grey-blue image and the yellow image overlap each other. Read the measurement. If you suspect it is in error, you can calibrate the 400 or 1000 or 1200 by turning the screw slot within the range dial using an object you know the distance to. If the two images are off in the vertical direction, there's a screw below the range finder to adjust that. Turn it very little. Regarding the model 610, mostly the same except to calibrate it, merely spread the adjustment knob apart (spring loaded) and turn the part of it nearest your eyes so the yardage matches the distance.
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