Convenient temperature measurement on refrigeration, air conditioning and heating systems – thanks to wireless connection to your smartphone or tablet Fast identification of temperature changes by graphic progression display Measurement data analysed and sent via testo Smart Probes App Problem-free application at measuring points that are a long distance apart thanks to Bluetooth® range up to 100 m Combined with a smartphone or tablet, the testo 115i clamp thermometer is the ideal temperature measuring instrument for carrying out servicing and troubleshooting on refrigeration, air conditioning and heating systems, as well as for installing them. It can also be used to measure flow and return temperatures.