These settings tune the Calculus engine at the heart of TankCalc. TankCalc's engine uses numerical modeling to obtain storage tank values, and there is a tradeoff between numerical accuracy and speed.

The math engine separately computes values for the cylindrical and end cap parts of a tank, and the end cap integrator's accuracy degrades more quickly with efforts to speed it up, which explains its relatively high default setting. This integrator's role in overall accuracy is particularly important when computing the volume of conical end caps. If a result for a tank with conical end caps isn't acceptable, by all means increase the "End cap integration steps" value below.

The "Root Finder Epsilon" controls TankCalc's height-from-volume feature. The entered number determines the numerical accuracy of results in this mode. Remember that the height-from-volume feature is relatively slow because it must perform a binary search for an acceptable result, and each step in the binary search requires a full integration.
