This water flow meter is used to observe water flow speed of water cooling system, in case the pump stops working and causes overheat. The creative design makes it simple and practical, easy to install, compact and durable. Green impellers are easy to observe and the standard G1 or 4 thread is widely used in computers or other water-cooling systems. And it is also an exquisite decor. Using premium aluminium alloy, this water flow meter is durable to use. It is 3.5cm long, 4.4cm wide, and 2.5cm high. It is widely used in computer water cooling system. Item Name: Water Flow Meter Material: Aluminum Alloy Thread Size: G1 or 4-inch Size Details: Size: 3.5cm x 4.4cm x 2.5cm or 1.38" x 1.73" x 0.98" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Water Flow Meter