I have had the good fortune to get a trainer off craigslist for $40! I'm psyched (though now we're having stellar weather and I haven't used it yet )!

Thing is, I don't know what type of trainer it is (wind, mag, fluid). It's an older Blackburn Trackstand, and the graphics make me think it's from the late 90's. What can I look for in the *works* that will tell me what type it is?

Thanks!!