There’s a variety of sophisticated laser measuring devices that cost an arm and leg—this one we reported on not too long ago costs $450—or you can take a look at the Sticky Yard Digital Measuring System, a combination of software and hardware that makes it damn-fool easy at about a tenth of the price.
https://gizmodo.com/leica-disto-a5-laser-distancemeter-167952
You apply the Sticky Yard, which is available with either adhesive or magnetic backing, to whatever you’d like to measure, take a picture of it, and then using the Sticky Yard software, you can accurately measure anything in the photograph. The $49.95 package includes an adhesive and magnetic Sticky Yard and the software.
Product Page [Emerge Industries] Thanks, Jim!