overall: 10 1/4 in x 11 1/4 in x 8 1/4 in; 26.035 cm x 28.575 cm x 20.955 cm
overall: 10 7/8 in x 11 5/16 in x 8 3/4 in; 27.6225 cm x 28.73375 cm x 22.225 cm
Object Name:
pH Meter
Description:
A pH meter measures the acidity of aqueous solutions. When asked about an instrument suitable for testing citrus fruit, Arnold Beckman, a young chemist at the California Institute of Technology, designed pH meter with glass electrodes. He showed a prototype at the American Chemical Society meeting in 1935, and then established the National Technical Laboratories in Pasadena. The firm became Arnold O. Beckman, Inc. in the 1940s, and Beckman Instruments, Inc. in the 1950s.
The inscription on top of this example reads “BECKMAN pH METER / MODEL G.” This model was introduced in 1935, and proved remarkably popular.
