Rick is right on here. You need about 20-25 feet. And speed can be up or down 5mph. Based on the company research.Yes, it gives spin rate and spin direction when throwing into a net. There is a minimum distance.....don't exactly remember the distance, but I get great readings from 20 feet into a net.
FYI, like the RevFire, I would not use this ball for speed measurements. But then again, I like speeds measured in 10ths of a mph. The DK ball is only mildly accurate on speeds when thrown from 43 feet.....I'd say plus/minus 4 mph.