Rack Ruler

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This tool has an admittedly narrow application, but I’ve found it quite useful for working in a datacenter. It’s a ruler that’s scaled to count spaces in a computer or audio rack, which measure a standard 1.75 inches, making quick work of documenting racks or figuring out if there is enough space in an existing install.

-- William Jacqmein  

Middle Atlantic 8 ft. Rack Ruler
$17

Available from Amazon

Manufactured by Middle Atlantic Products