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 942 pH Monitor ID - h415p956r AU - Karjalas' Photo Vision DA - 1980/// YR - 1980 AV - Beckman Historical Collection, Box 79 VL - Beckman Historical Collection, Box 79 AN - Beckman Historical Collection, Box 79 UR - https://digital.sciencehistory.org/works/h415p956r 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--Measurement--Instruments KW - Scientific apparatus and instruments KW - Beckman Instruments, Inc. LA - ER -