3 ms·

A piece of string is precisely 1.2cm long.

• bigiain 14y ago
  According to page 87 of the specification document (March 23rd 2013 revision), it's 12mm+-0.5mm, with a service limit of +0.5 to -1.5mm. There's a varience request in place to allow installation of 1/2" (12.7mm) string, so long as we use COTS imperial string with +0" to -1/16" tolerances.