... infrared welder T-835.1. Product Features:1. Machines use self-developed high efficiency infrared heating devices, using advanced PID intelligent ... requirements, press the blue front panel buttons (up key), the red button (down key), in the range of 0-450 °C, adjust ... PID adjustment percentage method, you can warm-margin PCB board, self-regulation. General preheating temperature is lower than 250 °C, ...