Sparling Instruments, located in El Monte, Calif., manufactures products for the measurement of water, chemicals and other liquids. It primarily serves municipal and industrial customers. Its products include propeller meters and its trademark Waterhawk, Tigermag and TigermagEP magnetic flow meters. It also produces ultrasonic flow meters to measure water, chemicals and slurries. Sparling Instruments was founded in 1912 as a manufacturer of propeller meters to measure water for irrigation, water distribution facilities and wastewater plants.