Micrometer or vernier caliper
For the width of a penny and a dime, you would typically measure in millimeters. The width of a penny is approximately 19.05 mm, and the width of a dime is approximately 17.91 mm.
millimetres
METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.
centimeter?
You could use either inches or centimeters to measure the width of a sheet of paper.
Centimetre.
Parsecs
You can use a penny for that. Put in between the threads then mark and measure the depth on the penny.
A tape measure.
You use a ruler or tape measure.
Millimetres
a ruler