3 inches of a plastic ruler placed over a curved ruler of about 90 centimeters.
A plastic ruler and a protractor with numbers such as 40 and 50 on lay on a wooden table.
Multiply rulers with black measuring lines and a black 60 printed on it.
A measuring devices with numbers including 40, 50, 60 and 70.
A ruler with the numbers 10 and  9 is laying with other measuring instruments.