I just bought one for the rental 150 I fly. It is a plastic tube. You put it in the tank, put your finger over the top and pull it out and read the quantity. They also have a universal one with just numbers on the side that you calibrate to your tank. I like them and they work really well and are easy to use. just a thought.
John
Can you name that plastic tube, or post a link to it so I can identify and order one?
Regards
John