Additel 273Ex Pressure Calibrator is an intrinsically safe handheld multifunctional pressure calibrator with a colour touchscreen, smartphone like interface, built-in quick test tasks and optional HART communications capability. This innovative Additel product drastically improves explosion-proof field testing and calibration. The Additel 273Ex has a built-in atmospheric pressure sensor, so that absolute pressure and the gauge pressure are easily facilitated. There are three pressure module inputs.