Using a hex wrench to tighten the hex nut on the underside of the knob mount.
℃/℉ is available and exchangeable
The LED indicator light display status when this device is power on.
The LED indicator light is steady on means this device is heating up
The LED indicator light is off means this device is not heating up (it may mean temperature overshoot, unsuccessfully connecting soldering iron handle or broken heating core).
Breathing state (The LED indicator light turn into lighter from dark then turn into darker, loop) means this device is under constant temperature.
The LED indicator light is flash means this device enter into sleep or standby status.