I received the larger iron and started to play with it. While trying to insert the thermocouple, I accidentally broke the wires and made a short circuit which killed the solid state relay. I took me a while to figure out the SSR was not working because it was triggering properly in the input and the LED was also working but the output was always closed.

I have a new one on the way and took out few learnings:

1. The device has a very big thermic inertia so it's rather difficult to measure the temperature and regulate it by inserting the thermocouple through the handle. The point in contact is separated by the ceramic wall of the heating element. Eventually I went back to the setup I used for the smaller iron which is to attach the probe using a garden hose coupling.

2.The wiring inside the handle of the iron is very fragile, open at your own risk :-)