TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: In Copyright, D TI - Instructions for the Beckman Oxygen Electrode Evaluation Kit, X-300-100 (final) ID - kd17ct39j AU - Beckman Instruments, Inc. AV - Beckman Historical Collection, Box 19, Folder 4 VL - Beckman Historical Collection, Box 19, Folder 4 AN - Beckman Historical Collection, Box 19, Folder 4 UR - https://digital.sciencehistory.org/works/kd17ct39j AB - This glass electrode was first used in Beckman pH meters and later other instruments. Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off rapid development not only of Beckman Instruments, Inc. but also of the electronic scientific instrument industry. KW - Hydrogen-ion concentration--Measurement--Instruments KW - Scientific apparatus and instruments KW - Oxygen--Measurement KW - Oxygen--Analysis KW - Beckman Instruments, Inc. LA - English ER -