The Pressure Pro allows three pressure transducers to be powered, grounded, and supplies output signals simultaneously. The Pressure Pro allows all three sensors to be independently zeroed. This unit will allow the user to use and display three different pressure transducers on the oscilloscope at once, thus helping with the mechanical testing of engines. When testing the internal combustion engine you will need to monitor in-cylinder pressure (300 PSI Gasoline, or 500 PSI Diesel), induction pressure (-30 Hg), and exhaust pressure (+/- 25 H20) simultaneously. Note: When using the Pressure Pro with your voltage measuring instrument 1 Pressure Transducer Cable (PTR1080) and 1 Pressure Pro to scope BNC Cable (PTR1100) is necessary for each Pressure Transducer being used.