\citet{Chauhan_2010} used two strain gauges placed perpendicular to the splitting test cut (visually in Figure \ref{496153}, the cut is through the pith, and the red strain gauges are placed perpendicular to it) and presented a correlation of 0.92 between predicted opening by the strain gauges and the measured opening. The same test was conducted here with Figure \ref{832874} showing the results, as is expected from the geometry of the testing procedure, the correlations are high. In contrast, Figure \ref{752700} shows how well the splitting test predicts the true surface strain, and Figure \ref{481059} shows the how well two strain gauges placed 180 degrees apart predict the true mean surface strain. Figures \ref{309412} to \ref{890019} show how well various numbers of strain gauges predict the true surface stress mean.