Assertion: thermometer's reading | /r/HasProperty | taken
Facets:
Source sentences:
text: Before a new maximum or minimum reading can be taken, the thermometer must be reset by moving the markers to the top of the mercury, usually by hand using a small magnet to slide them along the tube.
text: Widely available online or on the back of a psychrometer device or packaging, a psychrometer chart makes it easy to find the relative humidity once a reading has been taken.