TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: Public Domain Mark 1.0 TI - Instruction Manual, Zeromatic pH Meter ID - ms35t945j AU - Wheeler, A. Edward DA - 1957/07// YR - 1957 AV - Beckman Historical Collection, Box 105, Folder 73 VL - Beckman Historical Collection, Box 105, Folder 73 AN - Beckman Historical Collection, Box 105, Folder 73 UR - https://digital.sciencehistory.org/works/ms35t945j AB - Intentionally blank pages (28, 40, and 42) have been omitted from the digital work. 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 - Hydrogen-ion concentration KW - Beckman Instruments, Inc. LA - English ER -