This is a useful diagnostic tool for the home mechanic which is easy to use, although some of the functions require research to fully understand them. Howerver, I bought it specifically to switch off the airbag light on an Audi TT. It confirmed the exact location of the fault which I had suspected and turned the airbag warning light off.
the brake fluid us recommended to be changed every 2 years to check whether this is required simply dip this tool into the brake fluid ,it will tell you if there is water present and in need of replacing because water will not compress and the system becomes dangerouse