Metric Markings: Some tape measures may have both the imperial and metric measurements, with the imperial numbers at the top in red and the metric numbers at the bottom in black.

A tape measure comes with several markings that some may not know, like the black diamonds. Here's what those symbols mean and how you can use them.

Unlike other tape measure antennas we’ve seen, [Tom] just harvested the blades from two 7.5-meter tape measures, connected them end-to-end, and threw the whole thing out the window in sort of a ...