Electromagnetic bidirectional flow meters work on Faraday's Law of electromagnetic induction. They measure flow by detecting voltage changes that occur when a conductive fluid moves through a magnetic field. A primary advantage of these meters is that they have no moving parts, making them durable and low-maintenance. They can also measure corrosive or dirty liquids that might damage other types of meters. However, these meters only work with conductive fluids and may have accuracy issues at low flow rates. They are best used in water treatment plants, food and beverage industry, or chemical processing facilities.