A metal ruler with the numbers 20 through 100 displayed
Some silver mesh fabric has a ruler laying on top of it from 20 to 100 centimeters.
a ruler with many different digits on it
A metal with the numbers 20, 30, 40, 50, 60, 70, 80, and 90 is on top of silver fabric.
Silver and black ruler on a table that goes as low as the number 20.