Categories of exhibits
MALDI source lid
Exhibit no. 427
Some mass spectrometers have a vacuum chamber closed by a glass lid that allows you to see inside the instrument. The viewports are commonly made a thick piece of borosilicate glass, which is sealed by removable O-ring.
The exhibit is a glass lid, which covered the MALDI source of the TofSpec 2E MALDI-TOF spectrometer manufactured by Micromass in the 1990s. The pressure under the lid could be estimated by the degree of compression of the O-ring.