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Microbalance used during 1953 Mount everest expedition

1952-3
Perkin-Elmer AD-1 first electronic micro-balance with closed servo-loop. Range 0-1gm.

Perkin-Elmer AD-1 first electronic micro-balance, with closed servo-loop. Range 0-1gm.

circa 1980
Perkin-Elmer AD-2Z second generation electronic micro-balance. Commercially very successful but has an auto-zero feature which was unpopular. Range 0-1gm.

Perkin-Elmer AD-2Z second generation electronic micro-balance

circa 1990