... sale service ZH-220 Full automatic wave welding machine 1. The circular arc appearance, streamline design. 2. Into the board ... control accuracy ± 2 °C, between two wave off 5 °C maximum temperature. 7. Forced cooling system, fluctuation and cooling ... 5 °C, ensure the PCB board each original device get related cooling effect. 8. Transportation system, the wear-resisting aluminium, unique double ...