Additel ADT 273Ex [ADT273EX-GP100-PSI-N-HART] Handheld  Gauge Pressure Calibrator w/HART Communicator, ATEX Certified Intrinsically Safe, 0.02%FS, 0 to 100 psi, Gauge Pressure, 1/4NPT Male.  The Additel ADT273Ex handheld pressure calibrator is an intrinsically safe multifunction pressure calibrator with built-in quick test tasks and optional HART communications capability. The ADT273Ex has a built-in atmospheric pressure sensor, so that absolute pressure and the gauge pressure are easily facilitated. With three pressure module inputs, one switchable at the bottom and two digital inputs on the side, the user can configure the setup accordingly and easily meet the needs of pressure calibration and testing in virtually any environment. The ADT273Ex has passed ATEX, IECEX, CSA, and UKCA intrinsic safety certifications from authoritative organizations and the explosion-proof level is Ex ia IIC T4 Ga. This means that the ADT273Ex can be used in potentially explosive gas environments, such as oil and gas platforms, refineries, chemical and petrochemical plants, pharmaceutical industry, energy and gas processing industry.