Unless your guests love raw chicken and under-cooked steak, you probably want to make sure you have enough propane to last the evening for your next cookout. Problem is, it’s not always easy to tell how low you are. Refuel lets you monitor your tank’s fullness right from your phone. No more guessing by lifting up the tank and trying to determine just how heavy it is, and no more ruined barbecues. It’s waterproof – which is good cause we rarely grill in our living room – and it gives you an estimated amount of time your propane will last for. It’s in production now, so look for it soon.