Fluke 718Ex 300G Pressure Calibrator.
It is an intrinsically safe pressure calibrator designed for testing and calibrating pressure instruments in hazardous areas, such as oil & gas, petrochemical and process plants.
What it does
Measures and generates pressure
Measures 4–20 mA instrument signals
Provides 24 V loop power
Has a built-in pressure pump
Can test pressure transmitters, switches, gauges and sensors
The 300G version has a pressure range up to approximately 300 psi (20.7 bar) depending on configuration.
The “Ex” designation is important: it means the instrument is certified for use in certain explosive/hazardous environments when used according to its certification requirements.
From your photo, it also appears to include the test leads/probe and is packaged as a new/set unit.