DAR   is a differential flow meter for inspecting pump performance and checking the rated flow rate when installing or periodically inspecting fire extinguisher pump. Also, the connection can be made in flange type and in screw type as well, so it can cope with various piping arrangements.

This type is manufactured with a small diameter up to a large diameter for measuring a minute flow up to a large flow accordingly. This flow meter is of analog type for checking the flow rate by reading the gradation and is not restricted by the direction of the fluid flow.