ultramicrometer

n.

超测微计；

Field Emission Ultramicrometer
Optical ultramicrometer technique utilizing a composite diffraction grating
Note on the application of the ultramicrometer to the microbalance
XI. Note on the application of the ultramicrometer to the microbalance
LXVI. Note on the ultramicrometer used as a differential micromanometer
VI. The recording ultramicrometer: its principles and application
Crystal oscillator ultramicrometer
Crystal oscillator ultramicrometer
Observations of Plant-growth with the Recording Ultramicrometer
Note on the ultramicrometer used as a differential micromanometer