This activity allows students to work in partners or small groups to search the classroom for items which they think are close to the unit of measurement for length which the teacher assigns them. They then measure the items to see if it was smaller than, larger than, or exactly the same assigned unit of measurement.
The scavenger hunt is one sheet for students to fill out. I have also included the simple instructions for it. Students have fun doing this activity. It's easy to differentiate by giving more challenging units of measurement. Can be used for metric or standard, whichever you are studying, because you as the teacher are assigning students their unit of measurement.