The handy clamp thermometer testo 115i, in combination with a smartphone or tablet, is suitable for service and error detection on air conditioning and refrigeration systems, as well as for their installation. In addition to this, the measuring instrument can be used to measure flow and return temperatures. When working at temperature measurement locations which are far apart, the testo 115i makes the application considerably easier - thanks to a wireless connection to a smartphone or tablet and if the highpressure measuring instrument testo 549i is used simultaneously, individual refrigeration system parameters such as superheating and subcooling can be calculated. Users can read off their measurement values comfortably in the testo smart probes app installed on the end device. All measurement data are presented either as a graph or in tabular form. The measurement protocols can then be directly sent as pdf or excel files. Testo 115i, clamp thermometer operated with smartphone, for measurements on pipes with diameters of 6 to maximum 35 mm, incl. Batteries and calibration protocol