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 (draft) ID - k06988039 DA - 1956/// YR - 1956 AV - Beckman Historical Collection, Box 19, Folder 1 VL - Beckman Historical Collection, Box 19, Folder 1 AN - Beckman Historical Collection, Box 19, Folder 1 UR - https://digital.sciencehistory.org/works/k06988039 AB - Although the author is unknown, these instructions were most likely written by a Beckman Instruments employee. This glass electrode was used in Beckman pH meters. 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 - Electrodes KW - Hydrogen-ion concentration--Measurement--Instruments KW - Scientific apparatus and instruments KW - Oxygen--Measurement KW - Electrodes, Glass KW - Beckman Instruments, Inc. LA - English ER -