Smart digital technician assistance with a 4-way valve block and intuitive touchscreen, including a wireless temperature sensor, vacuum probe, and testo 770-3 clamp meter. Work as intuitively as on a smartphone – this is made possible by the digital technician assistance testo 558s. With touchscreen operation, configuration, control, and documentation become 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 a 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 via 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 technician assistance remains up to date.

The testo 115i clamp thermometer with smartphone operation allows measurements on pipes with diameters from 6 to a maximum of 35 mm, including batteries and calibration protocol. Comfortable temperature measurement on 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.