... QW-M15-1,2,3,4,5,6 Type Float Level Switch Controller APPLICATION Simple Construction, reliable performance: The ... period. Easy to install and convenient to adjust: The liquid level control scope can be adjusted at will with the ... strong generality: The product can be used to the level of sewage, acid-base solution of less than medium ... -4 W-5 USING INSTRUCTION Float switch (fluid level controller)