My struggle is to find a rangefinder that will give me a firing solution without using my phone which does not work in cold weather below zero F. No matter how I carry my phone keeping it warm and covered the display goes haywire when I get it out in the cold air. By the time I have ranged a target and gotten my gloves off to use my Strelok Pro App I can't see the screen. Also if the sun is bright on white snow it is almost impossible to see the screen. I am currently using a Sig 2000 with Strelok Pro with Leopold impact 29 reticle. This all works fine in warm weather albeit slow to have to range a target or animal, enter distance in App and dial the scope. What are some of the solutions you have come up with. Are there any all in one units and do they work well in cold weather? How accurate are the Sig 2400 and the Leica 2800.com and are their Ballistic solutions working?