Garmin Ext Temp Sensor temperature sensor Garmin's wireless Tempe temperature sensor measures the ambient temperature with an external sensor and sends data wirelessly to a compatible Garmin device. Monitoring the temperature is easy, for example on trips, when you attach the sensor to a backpack, jacket or shoes. Compatibility e.g. Garmin Fenix 5S, 5 and 5X Garmin Fenix 5S Plus, 5 Plus and 5X Plus Garmin Fenix 6S, 6 and 6X (both sapphire and Pro Solar models) Garmin Fenix 7S, 7 and 7X Garmin Epix Gen 2 Garmin MARQ Garmin Quatix 6, 6X, 7 and 7X Garmin Tactix Garmin Forerunner Venu, 2, 2 Plus and 2S Vivoactive, 3, 4 and 4S