it's not a defect: LOOK IN THE MANUAL!!!
(they best are used in pairs)
1) place gauge #1 on a 4' stick and #2 on a 10' stick and wait.
2) if the gauge #1 is completely under water, you have a flood and should start packing your stuff

3) if #2 is under water you're probably to late. (you should have buyed the boat to)
