Delta Instruments is a Bulgarian supplier of measurement, control, and automation equipment for industrial and energy applications. The company offers a broad range of products, including gas detection systems for toxic and explosive gases, process indicators, ON/OFF and PID controllers, signal converters and transmitters, and portable electrical and gas-testing instruments. Its portfolio also covers temperature, level, pressure, humidity, and fluid measurement and control, with products such as sensors, thermometers, flowmeters, valves, level probes, and pH and conductivity instruments.

For power and energy applications, Delta Instruments supplies power-quality analyzers, voltage regulators, fault indicators, and equipment for recording and monitoring electrical networks. It also provides data loggers and standard or customized systems for recording, visualizing, analyzing, and controlling process parameters. Specialized controllers are available for hydrophore systems with one to four pumps, using relay or frequency control. The company states that it can develop measurement instruments and controllers to customer specifications and highlights laboratory services, calibration of current clamps, and project experience.