For example, the flexible thermocouple wire can be laid through holes, gaps or door seals to measure air temperature. The testo 915i automatically connects to the smartphone/tablet or suitable testo measuring instrument via Bluetooth. The testo Smart App enables intuitive operation, clear display of measurement data as well as documentation and log sending directly on site. The handle is compatible with all commercially available type K thermocouple probes - making it versatile.- Smart Probe for wireless temperature measurement in a wide range of applications thanks to a large selection of probes and compatibility with commercially available type K thermocouple probes- Flexible and fast-response temperature sensor (TE type K, Class 1) with glass-silk sheathed cable (length 800 mm) and secure fixing thanks to innovative locking mechanism in the handle, versatile use, measuring range -50 to +400 °C- Easy operation, evaluation and documentation with free testo Smart App as well as automatic Bluetooth® connection to smartphones, tablets or Testo measuring instruments (e. g.e.g. testo 400, testo 550s) with a range of up to 100 m- High measuring accuracy due to system calibration ex works.