TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: In Copyright, D TI - Beckman Model H pH meter schematic wiring diagram ID - 8049g5061 AU - Beckman Instruments, Inc. DA - 1946/10/17/ YR - 1946 AV - Beckman Historical Collection, Box 18, Folder 24 VL - Beckman Historical Collection, Box 18, Folder 24 AN - Beckman Historical Collection, Box 18, Folder 24 UR - https://digital.sciencehistory.org/works/8049g5061 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 - Electric wiring--Charts, diagrams, etc KW - Blueprints KW - Beckman Instruments, Inc. LA - English ER -