Well that'll learnya. What do you think you get for ten bucks ? The knob, d o you REALLY think there is a thermostat under there connected to a thermal sensor near the tip ? NOOO, that is a rheostat. Those temperatures were ca lculated by someone who may know math but not all the variables.
They always said to use a low wattage iron on circuit boards. Well I used a Weller 8200 gun, 100/140 watts. As I soldered I turned it on and off with the trigger, maintaining the temperature I wanted.
Now my iron is about 60 watts I think but it is thermostatically controlled . Your iron can be five million watts if the temperature is properly regula ted. Of course if you're a real idiot you could burn through a board faster with a temperature controlled higher power iron, but I doubt that's in the warranty.
[just noticed my iron was still on, hmmm]
So I thik I paid like $60 for mine which is pretty good I think. Friend of mine paid a hundred and change for a Hakko which is a VERY good brand. I go t an elcheapo but it is a good elcheapo. When it hits the dust I guess I'll have to go with the Hakko because I want it to work right. I need to effec tively solder these boards without damage and I need what I need.
Tell you what, rather than that piece of shit, just get the absolute cheape st thing Hakko has and it will be orders of magnitude better. You'll love i t. I've used them.