Mass spectrometer used to accurately measure the mass of molecules.

Fullsize image: https://s3-us-west-1.amazonaws.com/h...o_fullsize.jpg



Previously:

NIST-4 Kibble balance - photo
Antique analytical balance - photo
NACA photopyrometric comparison analyzer - photo
Measuring surface tension using a tensiometer - GIF
Incremental laboratory funnel - GIF
Manual centrifuge - GIF