Features: Two standard thread options: G1/2 and G3/8. Seal ring with upper and lower compression structure ensures leak-free performance. Different liquid flow ranges produce varying pulse output signals. Flow rate: 5-300L/Hour (tested with oil), minimum start-up flow pressure required for oval gear operation: 0.5L/min. Suitable for measuring high-concentration liquids such as milk, chemicals, engine oil, detergents, etc. (liquid must be free of impurities). Specifications: Material: Plastic Length: Approximately 10.2cm (4 inches) or 8cm (3.1 inches) (optional) Wiring: Red - IN - Positive Terminal Yellow - OUT - Signal Output Black - GND - Negative Terminal 10.2cm sensor: Thread: G3/8 Frequency: 2.5 x Q(L/MIN) Inner/outer diameter: 8mm/12.5mm Screw length: 29mm 8cm sensor: Thread: G1/2 Frequency: 2.5 x Q(L/MIN) Inner/outer diameter: 10mm/20.5mm Screw length: 29mm Note: Please allow 1-3cm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image may not reflect the actual color of the item. Package includes: 1 x Hall Flow Sensor