This app was mentioned in 1 comment, with an average of 1.00 upvote
I like to use android as much as I can... and this is the most dead-simple app for android (you can see the index even without unlocking the lock-screen). Saves me the headache. I believe it was dev'd by some Austrian UAV folks... but I could be wrong. https://play.google.com/store/apps/details?id=info.kijk.Kmonitor&hl=en