What is used in a laboratory to measure length?

In a laboratory, length is commonly measured using tools such as rulers, calipers, and micrometers. Rulers provide basic measurements in millimeters or inches, while calipers offer more precise measurements for smaller dimensions, including internal and external diameters. Micrometers allow for even finer measurements, typically down to one-thousandth of a millimeter. Each tool serves specific purposes depending on the required level of accuracy.