This is a stainless steel type-J thermocouple temperature sensor. It was used on BrewMagic V350 systems until 2013.
If you are purchasing this as a replacement for the temperature sensor on your BrewMagic V350 system, please look carefully at what you currently have. If your temperature sensor has 2 wires, purchase this thermocouple. If your sensor has 3 wires, then you need to replace it with an RTD temperature sensor which can also be found on this site.