testo 915i - testo 915i - Wireless thermometer with flexible temperature probe (TC type K) and smartphone operation

Order-Nr.  0563 4915

  • Smart Probe for wireless temperature measurement in a wide range of applications, thanks to a large selection of probes and compatibility with standard type K thermocouple probes

  • Flexible, fast-response temperature sensor (TC type K, class 1) with fibreglass-coated cable (2.6 ft long) and secure attachment via innovative locking mechanism in the handle, versatile, measuring range -58 to 752 °F

  • 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. testo 400, testo 550s, 
    testo 557s) with a range of up to 328 feet.

  • High measurement accuracy thanks to factory system calibration

The testo 915i wireless thermometer with flexible probe will enable you to tackle your temperature measurements with greater speed, flexibility and ease. For instance, the flexible thermocouple wire can be laid through drill holes, gaps or door seals to measure the air temperature. The testo 915i automatically connects to your smartphone/tablet or compatible testo measuring instrument via Bluetooth. The testo Smart App facilitates intuitive operation, clear display of measurement data as well as documentation and sending of reports on site. The handle is compatible with all standard type K thermocouple probes – making it versatile.


Product Description

Wireless temperature measurement: The testo 915i thermometer with smartphone operation and Bluetooth is part of the popular testo Smart Probes portfolio. The thermometer provides fast, reliable measurement results and is versatile and easy to use thanks to the flexible probe – making it ideal for carrying out your temperature measurements, e.g. at measuring locations that rigid probes cannot access.

testo 915i - Thermometer with flexible probe and smartphone operation
  • Flexible, fast-response temperature sensor (TC type K, class 1) with fibreglass-coated cable (800 mm long), measuring range -58 to 752 °F
  • High measuring accuracy up to ±1.0 °F thanks to factory system calibration
  • For fast, wireless temperature measurements, e.g. in places that are difficult to access
  • Innovative locking mechanism on the handle for easy, secure attachment of plug-in Testo measuring probes
  • Versatile in all temperature-relevant applications: Compatible with all Testo and standard type K thermocouple probes
  • testo Smart App: Display of readings, clear graphical presentation of temperature curves, create documentation on site and send as a PDF or CSV file
  • Automatic Bluetooth connection to smartphones, tablets or compatible Testo measuring instruments
  • Bluetooth with a range of up to 328 ft
  • Handy, rugged housing
  • Thanks to its proven quality and great durability, you can rely on your Testo Smart Probe in all conditions

Delivery Scope

testo 915i - Wireless thermometer with flexible probe (TC type K, fibreglass-coated cable, 2.6 ft long), including batteries and certificate of conformity.

Related products

Technical Data

Temperature - Type K TC

Measuring range

-58° to 752 °F / -50 to +400 °C


±1.8 °F (-22° to 176 °F) / ±1.0 °C (-30 to +80 °C)

±(1.3 °F + 1 % of mv) (-58° to -30 °F) / ±(0.7 °C + 1 % of mv) (-50 to -30 °C)

±(0.4 °F + 1 % of mv) (176° to 400 °F) / ±(0.2 °C + 1 % of mv) (+80 to +400 °C)


0.1 °F / 0.1 °C

Reaction time

t90: 3 sec

General technical data


flexible probe: 0.282 oz. / flexible probe: 8 g

Bluetooth® handle: 3.104 oz. / Bluetooth® handle: 88 g


Bluetooth® handle: 5.08 x 1.22 x 1.22 in. (LxWxH) / Bluetooth® handle: 129 x 31 x 31 mm (LxWxH)

Operating temperature

-4° to 122 °F / -20 to +50 °C



Protection class


System requirements

requires iOS 13.0 or newer; requires Android 8.0 or newer; requires mobile end device with Bluetooth 4.0

Product colour


Plug-in probe connection

Lockable connection to 4 standard probes testo 915i; Standard plug-in connection to other common TC probes

Length probe shaft

31.496 in. / 800 mm

Battery type

3 x AAA

Battery life

150 h

Data transfer

Bluetooth®; automatic connection to testo Smart App and Testo measuring instruments

Radio range

328.08 ft. / 100 m

Storage temperature

-4° to 140 °F / -20 to +60 °C


Temperature probes

Immersion tip, flexible

Order Number: 0602 5793