Gas pycnometers measure the volume and/or density of solid objects through gas displacement and Boyle's Law. This particular model was marketed as early as 1961.

Also known as the DK-2 Spectrophotometer, this model covered ultraviolet, visible, and near-infrared spectral ranges. These men are likely part of the team that designed the instrument.

Also known as the DK-2 Spectrophotometer, this model covered ultraviolet, visible, and near-infrared spectral ranges. The Beckman DK Spectrophotometer was an enhancement of the DU, which expanded the instrument’s range…

The Model 72 was a line operated version of the Model 76 Expanded Scale pH Meter, designed for routine use.

Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus…

Capable of resolving each mass unit up to 60. Originally marketed with a $6,000 price tag, accessories were available to analyze hydrogen and helium.

Produced in the 1960s, the DB-G was a single-beam grating (as opposed to a prism) ultraviolet spectrophotometer.

The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still…

It is unclear from this photograph whether this is a Model 150 or 160.

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…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

First marketed in 1960, the Beckman/Spinco Model 120 Amino Acid Analyzer used the Spackman-Stein-Moore technique of amino acid chromatography.

The Pocket pH meter allowed pH readings to be taken in the field, in a laboratory, or at any site, without needing to send samples back to a laboratory and a more stationary instrument.

Arnold Beckman invented his…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

Dr. Arnold O. Beckman (1900-2004) is pictured here with his pH meter, which he invented in 1934 and which became the first commercially successful electric pH meter. Thus began a long career manufacturing scientific and…

Dr. Arnold O. Beckman (1900-2004) is pictured here with his Model G pH meter, which he invented in 1934 and which became the first commercially successful electric pH meter. Thus began a long career manufacturing…

Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career manufacturing scientific and medical instruments with National Technical Laboratories,…

Letter to Arnold O. Beckman about the early stages of planning marketing and distribution for the pH meter. The National Postal Meter Company on the letterhead was one of Arnold Beckman's first employers, when they…

Lyons writes to Beckman during Beckman's travels around the United States to market his new "acidimeter." This letter in particular mentions the orders rolling in following the first advertisement for the pH meter and…

From an unknown author at the Braun Corporation (and carbon copied to its president, J.A. Hartley). The author wants Aldoph Coors (the brewing magnate) to meet Arnold O. Beckman during Beckman's trip to promote his new…

This letter from Arnold Beckman was sent during his 1935 trip around the United States to promote and secure distributors for his new pH meter (or "acidimeter") in 1935. Beckman reports on the enthusiasm of both…