Additel ADT 673 [ADT673-02-GP500-PSI-N-232] Advanced Digital Pressure Calibrator w/RS-232 Communications Port, 0.02% FS, 1/4NPT Male, 0 to 500 psi. The Additel ADT673 digital pressure calibrator features wireless remote connectivity, microprocessor technology, state of-the-art silicon pressure sensors and onboard storage capacity. The modern menu structure of the Additel Link app gives users the ability to remotely monitor these calibrators from the convenience of a personal device or cell phone. With a variety of options to choose from, you can configure these pressure calibrators to precisely fit your specific pressure calibration and measurement needs. The ADT673 provides a pressure calibration solution for transmitters over a wide pressure range. It is a very portable device and can measure pressure precisely with a built-in pressure sensor, as well as read the current or mV produced by a transducer. It can even supply an excitation voltage (loop power) to power sensors or transmitters during calibration.