Features:
3 impeller water flow meter helps you to observe the speed and working states of the water flow.
Made of transparent acrylic material, durable to use.
Polished surface processing amplifies cutting property.
Adhesive type, easy to install and use.
The interface is G1/4 thread, diameter is about 12.9mm.

Specifications:
Type: Square, Semicircle 
Color: Red, Green
Material: Acrylic
Screw Thread: G1/4
Interface Diameter(approx.): 12.9mm

Package Includes: 
1 x Flow Meter(2 Ways; 3 Impeller)

Notes: 
1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 
2. Please allow 1-3cm measuring deviation due to manual measurement.