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This pamphlet describes approved methods for testing clinical thermometers. The National Bureau of Standards in 1927 was requested by a committee of the Associated Thermometers Manufacturers to assist in establishing a commercial standard for clinical thermometers, to encourage the production and sale of reliable thermometers and to protect purchasers from inferior and unreliable instruments. The proposed standards were drafted and adopted in 1928. The first revision was in 1931 and the second revision in 1940. In order to be accepted, thermometers must meet standards of construction, aging, pigment tests and tests for entrapped gas and accuracy. There are tests for "hard shakers" and for "retreating index." For the accuracy test, thermometers are compared at 98, 102 and 106 F. and must be tested in a certain prescribed way as explained in the pamphlet. Rigid tolerances of accuracy are demanded. The bureau is to be congratulated for its efforts in assuring
Clinical Thermometers: A Recorded Voluntary Standard of the Trade. JAMA. 1943;121(3):222. doi:10.1001/jama.1943.02840030060032
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