It is engineered for simple, fast, and precise measurement of temperature differences using dual thermocouple Type K probes. Featuring 2 measuring channels and Bluetooth® connectivity, it allows seamless data transmission to smartphones or tablets via the free Testo Smart App. This app enables quick device configuration, graphic history, second screen view, and storage and documentation of measurements. The illuminated display with hold function and acoustic alarm enhances usability and safety, making it ideal for HVAC systems, industrial processes, and laboratory environments.