Humidifier Quality Mainly is two part , PCB and Plastic .
First is Plastic part , if the order is develop some years ago , if the plastic part have problem , they mostly had solve , so not choose the model which just develop out , is better .
Second is PCB , PCB supplier is decide the PCB Quality, should choose the good quality PCB supplier such as Hanyi , but some model not develop by Hanyi PCB , if can not change , there is no other way . but now There are many New PCB Factorys , quality is ok too, so if know the PCB , also can find good Quality from the new PCB factory