Negative Positive
Title: Nonsensically inaccurate
Review: I ordered this item and got a a Monkey Grip branded gauge. The inch and millimeter scales are printed on the sides of the hexagonal bar that slides through the casing. All but one of the scales are not printed in the correct position on the bar, which means you will not get an accurate measurement most of the time if you rely on the scales. On my unit, only the scale marked 0, 3, 6, 9... millimeters was correctly zeroed. The marking for 1mm on the adjacent face of the bar (1, 4, 7...) corresponds to an actual 2mm measurement. The 2mm mark corresponds to a 3.5mm measurement -- 2 is more than 3! The scales for 32nds of an inch are similarly misaligned and non-zeroed. In fact, on my unit, a perfectly bald tire would have a groove depth of negative (a protruding groove of) 1/32 inch! I can't tell you if the other gauges offered on Amazon are precise, but for just a buck or two more I think you're better off with the other options.
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