HF25 series Metal Tube Rotameter is a variable area flow meter that can measure liquid, gas or steam even under high pressure and high temperature; as its sturdy, safe and endurable features, it is especially suitable for corrosive and cloudy liquid. Not only can HF25 ensure accuracy but also enhance its safety and reliability. Unique exterior design is benefit for explosion proof performance.  HF25 adopts magnetic detection sensor and chip process technology and its LED can indicate instantaneous flow rate and accumulative flow rate with two wire 4~20mA standard output signal, compatible with HART communication protocol. And also with high precision indicating needle and alarm switch output.