Brass Grill Indicator Gauge 2.25 in. H x 1.75 in. W x 4.25 in. L

Question it’s accuracy. Get the scale one instead. Weigh your tank when you get it filled. Set the adjustable arrow to where scale needle says full and leave it. When the scale needle get 20 pounds less than the adjustable arrow, it’s empty. Because, when they fill it, they put in 20 pounds of LP gas (liquid petroleum).

Works great! Have one on every backyard cooker I own.

never Works, never mark the gas tank ...

Husband loves it. And so do I, cause we don't run out of gas in the middle of BBQing.