毫米 (háo mǐ): Millimetre (Measure Word) — Meaning & Stroke Order

The thickness of this piece of paper is approximately 0.1 millimetres.

The doctor emphasized that even a one-millimetre reduction in the tumour's diameter is a positive sign.

Can you use the vernier caliper to help me measure the diameter of this screw in millimetres?

The weather forecast says the accumulated rainfall over the next two days may exceed fifty millimetres.