Why didn’t I know about these steel tape measures in my Dark Days of UNIXing? The Rack Ruler is a mylar-coated retracting tape measure with thumb clip, just like you annoy your dad with when you were a kid, with a critical difference: the Rack Ruler has measurements for computer and audio rackmount gear in addition to the standard inches, miles, Libraries of Congress, etc., meaning your days of trying to eyeball the U-width of an odd piece of hardware are over. Thanks, Matt!
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