A paper ruler that will measure length and width, L Shape?

At my job, I upload items to an auction website. I would like a piece of paper with an L shaped ruler so I can put something in the corner of the ruler and get both measurements at the same time. Is there something I can print off online or what? I'd have to have to try and make something myself. I really doubt my boss would do anything to help me either. Any help is appreciated. Thanks.