Bathroom scale and a 2x6, sprinkled with math.



https://noai.duckduckgo.com/?q=use+a...r&rpl=1&ia=web

If racing cars was my bread and butter as your name implies it is for you, I'd invest in the to-the-ounce accuracy of dedicated scales. Measuring all four corners real time while adjusting race weights would make the job a lot easier. Doing it for fun as I do, this is good enough as I might only measure once when the project is complete and again when I make a major change. A digital scale is easier to read than the spinny one I currently have, and my next one will be digital.