NAME: Truma Propane Levelcheck
WHAT DOES IT DO: This handy little device uses ultrasound to check the level of the liquid gas left in your cylinder. The LED turns green if it senses liquid, and red if it senses none, so you can tell at a glance when it's time to refill.
HOW MUCH: $90
FUN FACT: Personally, I prefer propane to charcoal - I don't care what any grill expert says