The Fuelhawk is clear lightweight and unbreakable. It's easy to use and gives an instant readout in gallons usable. No more guessing. These handy devices offer the answers to these very important questions:
Good way to have firm idea of how much fuel you have. Calibrate and carry the graph with the plane. Simple. No batteries required.
I just calibrated mine today. The process is easy and simple. Get the tanks as low as possible and then mark off every 5 gallons. The math came out PERFECT. Brimmed tanks came out to exactly my useable fuel capacity to within 0.2 gal +/-. I am extremely pleased with it and takes the guesswork out of filling the tanks. Also helps keep accurate burn rates for those of us without expensive engine monitors!
Been using this guy for several years now on my warbird. Have found it well-designed and durable, and Im about to get a second one for backup. When you stick your tanks before departure, it really doesnt matter how well the gauges work!