Arnold Beckman’s Acidimeter, later named pH Meter, measured the acidity and alkalinity of lemon juice. The pH Meter represented the first direct application of electronics to chemical measurement and sparked a chemical revolution. Today, the Beckman pH Meter is used in monitoring water quality, soil, sewer, and waste disposal, food and beverage processing, and blood analysis. 87 pH meters were sold in the first year grossing $11,215.95. Approximately 350,000 Models E, F, and G pH meters sold over the next 50 years.