1>flow meter,variable-area metallic rotameter 2>kinds:needle ... simple structure,work reliable,wide application field,high precision,convenient installing,it is suitable for compatible liquids, ... this series has the characteristics of high-pressureproof,high-temperature proof,safety,ocular reading etc,it is suitable ... value:0.5%FS±1msd 3.LCD environment temperature:-10+85 4.datas protect time:10 years ...