I came into possession of a large amount of strain gauges and I wondering what to do with them. Thinking about putting them into a wheatstone bridge and making a scale. each gauge is rated to 50 kg so was thinking of making 5 bridges which would weigh 1000 kg. Is there a market for weighing planes? Who does it? Would people be interested in a set of pads you can roll your plane onto and get a weight? I am thinking I could assemble a set like this for about $100 of parts. I found this article which talks to it: http://www.kit-plane-advice.com/weight-and-balance.html here the author makes this statement: "There is no regulation requiring a certified scale, even to weigh a certified aircraft. As long as you or the mechanic performing the weight and balance are confidant in the accuracy of the scale, it is legal." Can this be true? Based on what I know of the FAA it seems like it would be more regulated than that. Thanks in advance!