Use a ruler for short straight objects
Align one end of the object with the zero mark
Read the mark at the other end
Use a measuring tape for longer objects
Keep the tape straight along the object
Read the measurement at the endpoint
Use a meter stick for medium-length objects
Record the result in units such as millimeters, centimeters, meters, or inches
Measure from one end to the other end
Repeat the measurement if needed for accuracy