Scientists go to great lengths in their observations to get exact measurements. Find out how scientists around the world use the metric system, as well as which tools help them compare, contrast, and analyze the measurement data they collect. Questions and activities help readers develop their measuring skills. The Science Sleuths series encourages you to think and act like a scientist. Each book explores an important skill in scientific exploration. Questions and activities help you look at the world around you in a curious way-the scientific way! Book jacket.