Looking to Level your Scope? this is one of the solutions I use on a regular bassis. 
 
Place shots with increased accuracy by mounting your optics using the Fix It Sticks Bubble Level Set. Our turret level is magnetic for easy on/off, and our NATO/Pic Rail Level doubles as an anti-cant device for shooting. Both machined aluminum levels feature premium UK-sourced bubble vials for definitive precision.
 
Kit includes:
Magnetic level
NATO/Pic rail level/anti-cant device
Protective foam carrier with pouch