Here is the wattage adjustment procedure copied out of the manual
Adjust wattage: In TC-Ni/TC-Ti/TC-SS/TCR(M1,M2,M3) mode, the output wattage
can be adjusted from 1W to 100W. Press the fire button 4 times in quick
succession to enter the wattage setting menu and press up or down button to
increase or decrease the wattage level. Keep pressing up or down button without
looseness to rapidly increase or decrease the wattage level.
Adjust temperature: In TC-Ni/TC-Ti/TC-SS/TCR(M1,M2,M3) mode, temperature
can be adjusted from 100-315 or 200-600 by pressing up or down button, up
button to increase and down button to decrease. Each press of the up or down
button will increase or decrease the temperature setting by 5 or 10. Keep
pressing up or down button without looseness can rapidly increase or decrease
temperature setting.
Shift between and : If you increase the temperature to 315 , and continue
to press the up button, the temperature reading will automatically change to the
lowest Fahrenheit (200). Equally, if the temperature is set at the lowest
Fahrenheit (200) and you continue to press the down button, the temperature
reading will automatically change to the highest Celsius (315 ).