Bugs are perfect for pilots who rent aircraft, and for owners. They give you a very quick visual reference at a glance. The transparent suction cup works on all instruments. A thumb screw friction lock lets yellow pointer tip rotate 360°. Fly with it day & night. You’ll see immediately how much faster bugs are, instead of having to read and remember numbers.  INCLUDES: 2 Bugs in a plastic reusable storage box with instructions and 4 disposable alcohol swabs, which are used to clean the instrument face and the bugs so that they stick well. Having both clean is important.