It works, I'm not sure, and I don't care about accuracy either. The only bad thing I can think of is that when the wheel spins backwards, the numbers also spin backwards. Blocking numbers to prevent this would be nice. Nice, seems to measure well, folds well, light weight, comes with a backpack carry case and a couple of orange flags. I play frisbee with my dog and I needed him to roughly measure certain yards and use the orange flags as markers. Hope to give me a competitive advantage.
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