I found this cheap soldering station called OLED T12, which might be good for my current purposes (I'd like to solder cheap SMDs). According to the images 4 wires run from the station to the iron and the green wire is the ground. So I guess the tip is grounded on this station, which might be a slight ESD protection compared to for example the TS100, which - as far as I can tell - is not grounded. I found a similar Aiyima T12 station, which is AC, but looks almost the same as the first I mentioned and has 5 wires. I checked a few Solomon products too. The ESD safe irons and stations (triple the price compared to OLED T12) are always black and have 5 wires, while the non ESD safe products have only 4 wires and they are not black.
I'd like to know why the Solomon can solve this only with 5 wires, while the OLED T12 has only 4 wires and the tip appears to be grounded on it? I am pretty sure the OLED T12 is inferior to any ESD safe station, but I'd like to know whether it is any better than the TS100 from ESD perspective because of the grounding?