The Loop Tester is a tool designated for people involved in the commissioning and diagnostics of the FAS Fire Alarm System. The device is fitted in a compact case, making it easy to carry. It has a built-in rechargeable battery that allows it to operate for several hours without AC power connected. Functionally, the tester is particularly suitable for situations in which the installation is divided for few stages. It allows each individual loop to be addressed and checked, indicating current leakage, breaks and short circuits in the wiring. It simplifies the final configuration process, which is often delayed by the need to eliminate faults on the loops