For engines over 1000 cu. in. per FAA regulation 4313. This Differential Cylinder Pressure Tester combines the features of the popular 2E tester and a Master Orifice into one tool. Now you can conveniently check the calibration of your pressure tester before each use (in accordance with Teledyne Continental Service Bulletin M85-15) without disconnecting the tester.

Comes with complete instructions. Includes hose and spark plug adapter.

Note: For use with engines with Bore Diameters greater than 5" per AC43.13 REV 1B.