Features: 12 impellers water flow meter helps you to observe the speed and working states of the water flow. Made of high-quality acrylic material, durable to use. Polished surface processing amplifies cutting property and prolongs using life. Adhesive sealing, easy to install and use. G1/4inch thread is widely fit for most computer cooling tubes or connectors. Specifications: Type: Semicircle 2 Ways Model: LSJ-PM2A Optional Color: Black, White, Red, Blue Material: Acrylic Screw Thread: G1/4 Thread Outer Diameter: 12.9mm / 0.51in Surface Finish: Polishing Sealing: Adhesive Size: Approx. 4 x 4 x 2.3cm / 1.6 x 1.6 x 0.9in Weight: Approx. 34g Package Included: 1pcs x 12 Impeller Flow Meter112 impellers water flow meter helps you to observe the speed and working states of the water flow 2Made of high-quality acrylic material, durable to use 3Polished surface processing amplifies cutting property and prolongs using life 4Adhesive sealing, easy to install and use 5G1/4inch thread is widely fit for most computer cooling tubes or connectors