This soldering station is quite interesting, especialy for that price.
I got it for about 35€ plus 13€ for 5 extra tips.
The tips have the ceramic heating element included. The temperature is measured via the resistance of the PTC heating element. In cold state it has about 8Ω, @ 330°C (measured) it has about 16Ω.
This design has 2 major disadvantages: