When I teach the Metric System at the beginning of the year, I have my students do this lab. They measure the length of various objects, mass, volume of liquids, volume of a box (3D on the lab), temperature in Celsius, and answer a few wrap-up questions. Students complete some metric conversions along the way.
I have used this lab with 7th and 10th graders. It would be easy to modify to any level. It is in Word, so change anything as needed for your class!