I have a "Point and Measure Digital Tape" by Performance Tool. For indoor carpentry--its fine. It will find the square feet or cubic feet of a room. It has a red laser beam that you point at the surface you want to measure from. However...the actual measuring is by sound waves. It emits a tiny clicking sound and meaures the time it takes to hear the echo. Distance limit is about 60 feet, I think. It does not do well if the laser beam hits a slanted surface.
On the other hand...I may attach it to my Permagreen...and as an experiment...use it to find the swath width and keep it constant. (Seven feet to next tire track). Or maybe it would work for my Scotts spreader.