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Posted this in answer to another member, different problem, but thought it might be helpful to someone else looking particularly for testing brake fluid.
I use a dvom (method), there are several ways to test. The second method in the following link, is an after market type tester (I use dvom, because who doesn't have 1 or 2 around?).
Ramac.com - Auto Parts, Shop Supplies, Shop Tools, AUDI®, BMW®, MINI®, SAAB®, VOLVO®, VOLKSWAGEN® and More!
I agreed, if you drive and often brake hard, why bother to check? Brake fluid is cheap and easier to change than engine oil, just change it once a year or two year.