Testo 558s – the digital technician's aid with a 4-way valve block and intuitive touchscreen. This smart digital technician's aid features a 4-way valve block and an intuitive touchscreen, including a wireless temperature sensor and vacuum probe. Working is as intuitive as on a smartphone – that's what the testo 558s digital technician's aid offers. The touchscreen operation makes configuration, control, and documentation even easier. Alternatively, the device can be fully operated via the testo Smart App or, for working 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, any applications can be controlled via the technician's aid. For maximum safety, the technician's aid is compatible with flammable refrigerants of classes A3 and A2L. With over 96 refrigerants stored in the technician's aid and regular OTA updates, it always stays up to date.

Testo 115i clamp thermometer with smartphone operation for measuring pipes with 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.

Testo 552i app-controlled wireless vacuum probe, including batteries and calibration protocol. With the testo 552i vacuum probe featuring Bluetooth, you can measure vacuum wirelessly, quickly, easily, and precisely through just one service port – all without refrigerant loss. The testo Smart App supports this with numerous intelligent features.