The PS-6600 ST is "super tuff" and better than ever featuring push button calibration! Preferred by wrestling coaches for over 10 years. The PS-6600 is the best-selling wrestling scale of all time. You can't go wrong with this scale at this reduced price. MADE IN THE USA with a 3 year manufacturers warranty. Features include "push button" calibration, uses AC or NiMH rechargeable batteries, bright red LED display, large 16" X 18" "super tuff" cast aluminum platform, 500 lb. capacity, accuracy of +/- .1 lb., and a 3 year manufacturers warrantly.