Good question. The Accu-rite and the Ambient 5000 are all within 5 ft of each other. The main sensor for the 5000 is about 9ft. above the ground in order to catch the wind better. The Accu-rite and the 2nd sensor for the 5000 are 6ft above the ground. So I'm thinking the ones 6 ft above the ground would tend to be more official. Also did I mention all are beside a mountain stream there's still water flowing but don't know how much longer, if it doesn't rain. Thoughs and criticism are welcome.