First time I've ever used one.. doesn't work like it says and drums were left terribly out of tune and had to do it by ear anyway. I figured for the money it would work a little better than it did. With as many variables as there are when it comes to tuning.. I would recommend tuning by ear.. or with a torque tuner. Bearing edges, heads, and rims are all different in every setup.. this doesn't take all those things into account.