You don't want to do freezing point tests with gallium... it really likes to
supercool without freezing. A gallium triple point cell is the way to go.
Good reading here: http://www.nist.gov/calibrations/upload/met15-79.pdf
I once built some precision temperature measurement equipment that we
calibrated against an ice bath (using purified, degassed, DD water) and
boiling water (pressure corrected). The devices were then sent off to one of
the national labs where they did calibrations against water and gallium triple
points (and who knows what else). Our cheapo calibrations agreed in the
millidegree area. Their final calibration polynomial was something like a 23rd
order poly...
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