The WM2-H Series water meters are multijet (inferential) impeller meters. The only moving parts in the measuring chamber are the impeller and magnet. The strainer basket in the chamber allows for small particulates or impurities to be filtered and can pass through without affecting the operation of the meter. The impeller movement is transferred by a magnetic coupling to the hermetically sealed register. All materials used in the meter can withstand temperatures up to 195 degrees F.
This is very similar to our WM-H Hot Water Meter. When purchasing consider these differences: WM-H offered in 1/2" (WM2-H starts at 3/4"), Flow Rate tolerances vary slightly.