Question

building vocabulary: word roots, affixes, and reference materials
chron = \time\
chrom = \color\
meta = \change, beyond\
meter = \measure\
mono = \one\
based on the list of word roots, what is the meaning of the word chronometer?
a tool for measuring color
a device for measuring time
something that changes color
a single time period

Explanation:

The word "chronometer" is made up of "chron" (time) and "meter" (measure). So it means a device for measuring time.

Answer:

a device for measuring time