Only measures to 1/2 inch. Also, the increments are tenths of an inch. The US standard ruler is divisible by at least 1/8th of an inch, and many are divisible by 16ths of every inch. I can still use this mat for general crafts, but I can't use it to accurately measure the 1/4 inch cuts needed to make mask straps. Luckily I have a smaller Fiskars mat to use for this.
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