I've read reviews from people that the measurements were inaccurate. I assume they don't offset the bars. That's what I mean. The device says that when the measuring sticks are closed and empty (there's no skin between them) the dial should read 0.1mm, not 0. So you'll have to turn the black outer wheel for this to be true. This now means that if you hold the device and don't press the measuring sticks, the scale will read about 0.6mm. You might think it would be 0, but it isn't. See my photos if it helps. Either way, if you follow the instructions, the thing works great. I removed one star because I wish there was a mm to ounce conversion.
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