Speaking from personal experience and the advice of several mechanic friends.
Brake fluid has a tendency to absorb moisture. When that happens the fluid turns from a light honey color to a black color. The moisture in the fluid will corrode the brake parts costing you repairs in the future as...
There are a number utilities that will do this for you.
As the user interface is a personal preference just google "youtube capture" and you will see many choices. Some free, some not.