関連ワード:  what is the function of float switch    what is the purpose of float switch    what is the function of level switch    what is the function of a float switch in a water storage tank    what is the function of a float switch in a break cistern    what is the function of the float level switch    what is the purpose of level switch    what is the purpose of the float switch in a dishwasher    what is the function of the low level switch    what is the purpose of a pipeline float switch