a ruler
You would use a ruler or measuring tape to measure the length of an object. Place the edge of the ruler or tape at one end of the object and note the measurement where the object ends. Make sure to read the measurement carefully to get an accurate length.
Use a ruler.
You could use a ruler or a measuring tape to measure the length of an object. Both tools have markings that allow you to accurately determine the distance from one point to another.
a cm
A scientist would most likely use a ruler or caliper to measure the length of a nail or other small object. These tools provide accurate measurements in centimeters or inches.
To measure a foot length you could use a ruler, a yard stick, a tape measure, or any object that you knew was precisely one foot long on a side or edge.
a ruler is used to measure it and cm, sometimes inches to
You use a ruler or tape measure to measure this in units of choice
A meter rule.
I would use feet
You would use meters.
It is necessary because measuring tools help you measure the length of an object accurately.