TY - PCOMM DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: In Copyright - Rights-holder(s) Unlocatable or Unidentifiable TI - Letter from L. H. Duschak to Arnold O. Beckman ID - z890rt316 AU - Duschak, L. H. DA - 1935/05/03/ YR - 1935 AV - Beckman Historical Collection, Box 14, Folder 8 VL - Beckman Historical Collection, Box 14, Folder 8 AN - Beckman Historical Collection, Box 14, Folder 8 UR - https://digital.sciencehistory.org/works/z890rt316 AB - Duschak comments on the price of the pH meter (high, but in line with comparable instruments) and inquires whether or not the "acidimeter" could be sold again after his project is finished. 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 - English ER -