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A convenient, lightweight (6 oz.) pocket sling psychrometer for everyday use. Two mercury-filled 5.5\u00e2\u20ac\u009d thermometers are attached to an aluminum back with a handle for whirling. Handle folds when not in use. 7.5\" long. Instrument range is displayed in 1\u00c2\u00b0 divisions. 20\u00c2\u00b0-110\u00c2\u00b0 Includes humidity tables and carrying case.