Our card reads 30 degrees on the close side, and our degree wheel reads 29 degrees-only 1 degree off. Our open reading is 102. Since 180 minus 102 is 78, that's our reading. This is also good because our card reads 79 degrees. Though off by 1 degree, we're going to call ours straight up. Since we like the cam profile the way it is, we'll give it a chance.