You've got a jobsite instrument.
FieldCalc runs on Construction Master Pro's proven math — feet-inch-fractions, rafters, stairs, arcs, materials. Three things worth knowing:
1Type dimensions largest-first: 10 ft 1 in, or tap / for fractions. Add, multiply, convert — units come along.
2Press a function like Stair or Diag repeatedly to step through every result. The bar up top shows where you are.
3Tap Conv (amber) for the orange second function on any key. Hold any key for help.