ELSE vs REFR Comparison

Electro-Sensors Inc manufactures and sells industrial production monitoring and process control systems. It manufactures a complete line of monitoring and control systems for a wide range of industrial machine applications. The systems measure machine production and operation rates, as well as regulate the speed of related machines in production processes. Its products include motor drive control, position monitors, sensor targets, signal conditioners, speed sensors, speed switches, tachometers, temperature sensors, vibration monitors, etc.

Research Frontiers Inc is engaged in the development and marketing of technology and devices to control the flow of light. The company develops and licenses its patented suspended particle device light-control technology to other companies that manufacture and market the SPD-Smart chemical emulsion, the light-control film made from the chemical emulsion, the light-control panels made by laminating the film, electronics to power end-products incorporating the film, or lamination services for, and the end-products. The company's revenue source comes from the licensing of technology.