power brownout logger?

Sorry if this is a little off-topic, but after hunting around on the net I couldn't find the right search term to find what I'm looking for. OK, my power company sucks. I have brownouts and power outages all too frequently. Yet when I look at the statistics recorded by the public utilities commission, it seems obvious to me that they aren't showing an accurate record of what happens at my house. So I'm looking for a device (I'm fairly certain I've seen these before) that I plug into a wall outlet and it keeps a log of voltage sags, brownouts and outages. Then I can use this to build a reliability profile of my power company as raw data to compete with their b.s. line that its never their fault when my power constantly sucks. Any suggestions?