Air pressure measuring device

The device (1) has pressure sensor and compressed-air connection. The device is designed portable and includes control electronics, user interface and radio transmission unit connected with each other. A time detecting unit is provided for measuring response time of the air braking system. An electrical rechargeable battery for power supply is provided in time detection unit. Independent claims are included for the following: (1) braking pressure testing equipment for examination of air braking system; and (2) method for testing air brake system of rail vehicles.