The Extech PT30 is a Pressure Transducer for 30 psi measurements with the SDL700 Pressure Meter/Datalogger and the 407495 Heavy Duty Pressure Meter with Interchangeable Transducers. For air or non-corrosive/non-ionized gas. 6.4 mm (1/4”) PS, 19 teeth per inch with 1.2 m (3.9 ft) cable.