Digital gauges and indicators, also known as DRO (Digital Read Out), are electronic instruments used in metrology to make precise measurements and display the measurement results in real time. Digital gauges can be used for a variety of measurements, including measuring lengths, angles, velocities, temperatures, and other physical quantities. A DRO typically consists of a digital display unit and sensors or gauges attached to the machine or tool. The sensors collect the measurement data and send it to the display device, where it is displayed in real time. Digital gauges and indicators provide greater precision and accuracy than traditional analog gauges. DROs are widely used in manufacturing, especially metalworking, to improve the accuracy of machine tools and other manufacturing equipment. They can also be used in quality assurance, research and development, metrology, and other applications where precise measurements are required.