Well, that is correct (for you, it may be different for a different person). Take it for more testing, like my favorite: take several AA or AAA batteries (they could be dead), wrap them in a paper so that you don't see the ends and dowse for the polarity and mark it inside. Once you get 10 out of 10 (or something close to it) - you are cooking!
Mind you - dowsing future events can be tricky, especially if it involves somebody's free will. It's better to dowse for "side effects" - checking the mood of the fans after the game, dowsing trends instead of daily trades, etc.
I'm yet to meet a dowser who can accurately dowse winning lottery numbers, but on the other hand - would I reveal it if I could do it? I'm not so sure...