Length of a Jo
How long should a jo be? I see them sold in lengths from 50 inches to 54 inches. I assume that if I were 6'5", I'd need the 54 inch one, and the 50 inch one if I were 5' tall. Aside from that, is there any specific guide? For example, in Karate, the sai should extend about an inch beyond the elbow (for poking purposes).