S.B.
I have tried all different ones too. I have the ear one now and definitely you have to get it at the right angle. I also have a digital one to go in her mouth and it seems to work. I pretty much use both and if both come back with a fever number...I assume it's right. Anyhow, the ear one I have now is the cvs brand and I like it. I had the cvs head scan one and it was always giving me numbers all over the place...so they let me exchange it for the ear one. So, go buy one there and if you don't like it- they have 100% satifaction guaranteed. You can return it if you don't trust it. :)