I started with a single hydrometer. One day I broke it. So I went without that day, and then bought another. Then broke that one. Then I bought two. Then I got two more in a craigslist buy with a bunch of other stuff. I broke one more, but still have plenty. It's been a while since I broke one.
Uh-oh did I just jinx myself? Good thing I just brewed. That gives me a month for the jinx to wear off.