... (rechargeable), back-lit 4 lines letters display all integrated into a rugged, watertight enclosure.3.cost-effective and ... ultrasonic flow meter:1.Water, including hot water, chilled water, city water, sea water, etc.2.Sewage and drainage water with small particle quantity. ... and food processors7.HVAC hot and cool water, water /glycol solutions.8.Water and waste treatment9.Power plants, heat energy ...