I wouldn't put all the blame on Fluke though. The way trademark law works means you could lose a trademark if you don't actively enforce it, and Fluke's legal department is just doing what they have to do to protect their trademark. The problem is the fact that trademarks (and copyright) can be interpreted to such a broad extent in the US (most known example is mickey mouse copyright that covers anything with one large circle and two smaller circles). Most other parts of the world have far narrower definitions of what can be trademarked, for example China has a strong "generics" doctrine which led to companies denied registration of their own trademark that is well known in other countries, simply because the market was already flooded with bootlegs and the name was seen as "genericized".