The reasons you need to buy the ST-400F Middle wave solder: Mid production requirement in the range of 600-1200pcs/8hours (Take 300x300 PCB as reference) Lead-free requirement Tight budget and tight space but in-line needed CE needed Touch Screen control. Can store some parameter and control machine very stable Ti fingers for conveyor, high temperature resistant and long life warranty The sprayer is made in Japan; it provides perfect atomization performa -nce of the flux Sprayer droved by German air cylinder, small noise and long life warranty Two forced air convection preheat zones control by temperature controller in PID model. The preheat zone will provide enough uniform heat for the PCB Adopt cast iron heater for the solder pot, it’s mounted outside of the solder?pot. This new assembling way will prolong the life of the solder pot Dual wave solder. Both wave heights are controlled by transducer. Changing the wave height via adjusting the frequency of power The solder pot is made of Ti material, long life warranty High quality R&M wave motor which made in Italian, small noise and more stable Customer can set on and off time of machine weekly via timer Light&Sound alarm for overheating and emergency stop The conveyor system is equipped with overload protection