Welcome to one of the most significant technological breakthroughs in Wildland Fire Service history. The world's first ever 'TOTAL' Engine Pressure (EP) calculator, for Apple devices. Simplify the required mathematical processes in which you, as a driver/operator, are accountable under NFPA 1002. Produce an effective fire stream at the rated flow of the nozzle, under all conditions. Supports both Light and Dark mode for easy viewing in different environmental conditions.