A metal ruler has 0.5 mm on the upper left corner.
A metal ruler and with a piece of round metal on it measuring 1 to 2 mm.
A metal object sits on a metal ruler between the 1 and 2 centimeter marks.
A ruler is measuring a bolt between the "1" and "2" mm mark.
A small bearing placed on the steel rule in between the number 1 and 2 in mm side.