This mainly led to solid state devices, while we did not refrain from fully battery driven tube equipment, although those may by too big in size, in weight and in budget for many.

Solid state relay (SSR) is ideal equipment that using weak power to control strong power, which has extensive application in SCM measuring and controlling system.

This article introduces the concrete method that the equipment of spraying-extraction fermentation renovated from that of low-salt solid-state soy sauce fermentation.