Anyway to monitor temps inside TT when gone for day? ideas?

thanks for all the posts ideas and responses. I am almost lost and this technological ideas is pretty much now over my head. If it helps, yes my wife has internet connection on her phone and yes were are staying at a KOA where they have WIFI. So which option is my best route if I don't want to spend a fortune on it??
http://store.lacrossetechnology.com/temperature-and-humidity-monitor-and-alert-system
Again thanks for everyones help!!!

or http://www.amazon.com/dp/B00ISKS8HG/ref=cm_sw_su_dp