I know this is late..... But screw it.
I am on my second one. First one had issues picking up any ranges when there was some light fog/mist in the air. Early morning would only range to about 5-8 yards until the sun came up and burned off the fog. I sent that one back, and the replacement they sent me (brand new in the box) has the same damn issue.
Mildy frustrating considering the fact that in the early morning when most people are hunting it typically tends to be a little misty or foggy. If it was not for that, I love it. Does everything else great. I love it for shooting 3D, sighting the bow in, picking out range marks in the field while hunting. Does everything great, except ranging in the fog.