Why the C&I MACH 10? Combined with a corrosion-resistant, lead free, high-copper alloy maincase, the MACH 10 ultrasonic water meter is built to withstand demanding service conditions and guaranteed to deliver sustained accuracy over the life of the meter. This lightweight meter can be installed in both horizontal and vertical applications with ease. The MACH 10 is certified for fire service use and is UL Listed and FM approved.