1.Easy to operate,perfect self-protection functions 2.IGBT series circuit 3.heat homogeneously. 4.perfect after sales servic 1.Technique parameter ... itself, such as over-voltage, over current, lack of water, phase fail, over hot, etc. 8).Digital auto-control, it has ... . such as, over-voltage, over-current,lack of water, phase fail,etc.3)auto frequency tracking, the power can be adjusted to ...