If I may the second ball is part of the genius of his design. Rocking the instrument is one of the reasons for inaccurate readings with the Brownells' gauge. The two points give the operator reference. The truss construction of his design of the lower beam, the second part of the design genius, restricts the inaccuracies from bending experienced in the Brownells' gauge. All this in a portable instrument. I hope it works as good as it looks cause I think this instrument is a winner and I hope he can make some bucks with it.