What is the primary use of a graticule on a microscope slide?

What is the primary use of a graticule on a microscope slide?

• A. Measuring temperature
• B. Counting cells or estimating quantities
• C. Staining specimens
• D. Holding the slide in place

Answer: (B)

A graticule acts as a tiny measuring scale inside the microscope eyepiece. When you calibrate it with a stage micrometer, you can convert what you see in the field of view into actual units and use that scale to estimate how many cells or particles are present in a given area. That ability to quantify by area makes estimating cell counts or densities the primary use. It isn’t used for measuring temperature, staining, or holding the slide in place—those tasks rely on different tools like thermometers, stains, or stage clips.

A graticule acts as a tiny measuring scale inside the microscope eyepiece. When you calibrate it with a stage micrometer, you can convert what you see in the field of view into actual units and use that scale to estimate how many cells or particles are present in a given area. That ability to quantify by area makes estimating cell counts or densities the primary use. It isn’t used for measuring temperature, staining, or holding the slide in place—those tasks rely on different tools like thermometers, stains, or stage clips.