Smart digital technician assistance with a 4-way valve block and intuitive touchscreen, including a wireless temperature sensor, vacuum probe, and a set of four filling hoses. Work as intuitively as on a smartphone – this is made possible by the digital technician assistance testo 558s. The touchscreen operation makes configuration, control, and documentation even easier. Alternatively, the device can be fully operated via the testo Smart App or, for use with gloves, through buttons. For even more convenience in daily work, measurement results can be displayed on the large color screen in clear graphics as well as in 30-minute trend curves. The high measurement accuracy of 0.25% Full Scale also allows for reliable evaluations. With a variety of stored measurement menus and connectivity across the entire Testo refrigeration portfolio, all applications can be controlled through the technician assistance. For maximum safety, the technician assistance is compatible with flammable refrigerants of classes A3 and A2L. With over 96 refrigerants stored in the technician assistance and regular OTA updates, the device always stays up to date. The testo 115i clamp thermometer with smartphone operation is designed for measuring pipe diameters from 6 to a maximum of 35 mm, including batteries and calibration protocol. Comfortable temperature measurement for refrigeration, air conditioning, and heating systems – thanks to wireless connection to a smartphone or tablet. Quick detection of temperature changes through graphical trend display. The testo 552i app-controlled wireless vacuum probe, including batteries and calibration protocol, allows you to measure vacuum wirelessly, quickly, easily, and precisely through just one service connection – all without refrigerant loss. The testo Smart App supports this with numerous intelligent features – for example, you can instantly recognize vacuum at a glance through the graphical representation in the app or on the display of the technician assistance.