These soldering iron tips include the thermocouple for temperature regulation. Not until I bought an angled tip did I realise that the original tip was reporting too high a temperature. (I had to turn it up high in normal use).
That prompted me to buy this one as a not quite direct replacement.
They appear well made and both the ones I have recently purchased are working correctly.
However, I now realise that the original one has been faulty (inaccurate) from day one so failures can occur.
They are also relatively expensive.
Delivery was prompt and efficient.