
For $20 it's cheap enough for professionals, students, and anyone who likes to putz around with random contraptions on their desk—and on a single cell-sized battery you can expect to get about 3,000 hours of use out of it. For anyone not intending to use it as a toy, a locking mechanism keep the rulers at the angle of your choice when drawing lines, while a set of holes at either end let you hang or anchor it in place for tricky measurements. It almost makes me want to go back to school again. (Not in a thousand years.)

[ThinkGeek]
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