Customer just gave me 2 scotts spreaders. Brand new in box. These are speap-ish homeowner type spreaders but hey...free. They are assembled, and I calibrated them. Can't find any info about their spread rates. Do the number mean lbs/1000 sq ft? (1 = 1lbs/1000 sq ft, 5 = 5lbs/1000 sq ft, etc). I figure after all I have all the basic info then I can do the 10x10 tarp method. The two models are a "Scotts speedy green 2000" and a "Scotts turf builder edge guard DLX" In case anyone else needs to calibrate using scotts method: Scotts speedy green 2000 - Put it on "2" setting. "Squeeze trigger against handle. The calibration line on the top of the shut off plate should be aligned with the back edge of the hopper opening." Or basically, pull the handle to open the hole, and watch for a small line on the black opener to be alighted with the green hopper. Scotts turf builder edge guard DLX - set spreader to "4". A 9/13th drill bit should fit tight/snugly inside the opening when handle is pressed.