To make a Haugh unit measurement of an egg, it is brought within a specified temperature range, weighed, and broken onto a flat plate. A tripod micrometer is then used to measure the height of the albumen midway between the yolk and the edge of the albumen. A comparison of this height with the weight of the egg yields a whole-number score, typically between 20 and 100, or somewhat more. (Slide rules for making the comparison are commercially available, and the comparison may be built into the scale of the micrometer.) Scores of 90 and above are considered excellent, 70 is acceptable, and buyers generally reject eggs that score below 60. In United States egg grades, AA grade eggs score 72 HU or higher, A grade, 60 – 72 HU, and B grade, lower than 60 HU (all measured at a temperature between 45°F and 60°F)
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