The Fluke 154 is a standalone tablet based HART communication tool. The tablet configured with the "FlukeHART" mobile app utilizes a wireless HART modem that connects directly to the HART transmitter being tested or configured. When you combine your Fluke 154 HART Calibration Assistant with a Fluke 750 Series Documenting Process Calibrator, or a 720 Series Multifunction Process Calibrator you have a complete HART calibration and configuration solution. The 154 puts HART device configuration at your fingertips. An Android_ based tablet user interface makes HART configuration easy. The external wireless modem allows you to connect the modem to the transmitter being tested so you can communicate to the device remotely.