TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: In Copyright - Rights-holder(s) Unlocatable or Unidentifiable TI - Beckman Model 900 pH Analyzer (Interior) ID - 9s161641g AU - Armstrong & Hess DA - 1969/// YR - 1969 AV - Beckman Historical Collection, Box 84 VL - Beckman Historical Collection, Box 84 AN - Beckman Historical Collection, Box 84 UR - https://digital.sciencehistory.org/works/9s161641g AB - 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--Measurements--Instruments KW - Scientific apparatus and instruments KW - Beckman Instruments, Inc. LA - ER -