I brought two calculators , TI-BA II plus, one new, and the backup, a used and abused one I got from ebay. I walked out of the exam with only one.
For the L1 exam last Dec., I was in a line, outside the testing room, waiting for the doors to open, and a chinese guy who looked like he just got out of bed and ran to the testing centre approaches me. He was panicking - wearing track pants, hair sticking out, don’t think he even had the time to wash up. Huffing and puffing, he asks me that since I had two calculators, if he can borrow one. WTF?! I said no. As we’re beginning to shuffle into the room, I took another look at him. Absolute misery. The dude was just staring blank outside. All that preparation down the toilet.
I went back to him, who was just loitering around the door, and gave him my half-busted backup calculator. He opens his wallet and takes all the money in it, and hands it to me - 80 bucks, I think. I had a house-warming party to go to that night after the exam, so I spent the whole 80 bucks on some cheap bottles of champaign.
So, pays to bring more than 1 calculator. You never know.