Mr. Unknown 3 This product is easy to use, but the manual is bad!Calibration:In the manual it says to hold ▲ and ▼ until you see CAL,you should actually turn it off, hold ▲ and then turn it on, the "." is then blinking moving back and forth and you can set the temperature.in my case at 250C the temperature was actually 200, so i set my calibration to 50.At windspeed 8 it will only become 350C even though its set to 500 -- no change even with calibraton.Careful not to cover where its sucking in air or you might burn out the heating element in the handle, i unfortunatly often happen to cover it so im afraid the durability is not good.Overall:Its cheap, so an acceptable product for beginners, im mainly using it for small components and wire shrink sleeves like: https://www.amazon.co.jp/-/en/dp/B08WRT3Y35My next one will probably be: https://www.amazon.com/Weller-WTHA1N-Hand-Tools-Soldering/dp/B01N1RL5AF