I just measured two points and was surprised to get what appear to be errors in the measurement. See the attached pictures. When I measure the first point, the X and Z values are even at the second number after the decimal point. When I measure between the two points, the difference is 0 in X and Z. But when I measure the second point by itself, the X and Z values are not even. The differences are 0.00000053 in X and 0.00000224 in Z. I'm not too worried about numbers that small, but the folks working in really small parts might. Why the difference?