Great for finding lost Fitbit!

Enable the sound in settings so that you get beeps. Higher pitch means you are closer, and beeps get more frequent. If you have more than one low energy bluetooth device, youll get beeps from all of them, which can be confusing unless you select the one you want. It would be helpful if we could label devices to make it more obvious which to pick. Also a graph showing strength as a function of time. But even without this, this is the app to get if youve lost a bluetooth LE device

F-sam about Bluetooth Smart Scanner