n. an instrument for making extremely fine measurements of thickness or length, often relying upon the movement of a screw thread and the principle of the *vernier.
a laser that emits optical pulses with a duration of femtoseconds (fs; 1 fs = 10?15 s), allowing micrometer-level accuracy and needle– or blade-free surgery. It has the potential to carry out lens extraction or cataract surgery through a pin-prick incision.... femtosecond laser
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