Compact speed monitors are a category of industrial monitoring devices designed for measuring and controlling the speed of rotating machinery. These devices are typically manufactured by specialized companies in the automation and control industry, such as those based in the United States or Germany. For instance, brands like Red Lion Controls (US) or Pepperl+Fuchs (Germany) produce compact speed monitors that cater to sectors like manufacturing, energy, and transportation. These products often include tachometers, encoders, and proximity sensors, ensuring precise speed measurement for conveyors, motors, and other equipment. While 'Compact speed monitors' is not a specific brand, it refers to a product classification widely available through industrial suppliers like Radwell and Grainger.