Extech 407495-NIST - NIST Calibration Certificate - Heavy Duty Pressure Meter features: Meter stores range and calibration data for six pressure transducers; Accepts interchangeable transducers with ranges of 30, 75, 150, 300, 700, and 1500psi; 0.25%FS basic accuracy; Displays 8 types of pressure units; Push button transducer selection; Built-in RS-232 PC interface; Data Hold, Auto power off, Min/Max and Zero function for offset correction.