Got lots of beacons around and having trouble isolating your particular test beacon? While some beacons can be physically turned off, many others can only be set to stop advertising via changing their settings. Moving between tests can be time consuming. A solution is to use a faraday bag to hide beacons you want to ignore for now. The bag is also useful for forcing iBeacons to go out of range (for about 30 secs) so they will trigger again on iOS.
The bag has an internal wire mesh that keeps Bluetooth signals inside the bag. One thing to beware of is you need to keep the bag closed at the top to stop signals escaping. Fold over the top and close the bag against itself along the line of the velcro.