Ultrasonic Level Difference Gauges, Dual Channel Level Gauges – Can operate independently with single or dual probes, or provide differential output. Applications: Suitable for measuring the difference in elevation before and after a dam, water level differences in pools, and material level differences. Features: Capable of multiple outputs such as GPRSNBROLARS485, and available in various power supply modes including 220VAC, 24VDC, and 12VDC.