Features: Standard thread options: G1/2 and G3/8. Seal ring with upper and lower compression structure ensures leak-free performance. Designed for various liquid flow ranges with corresponding pulse output signals. Flow rate: 5-300L/Hour (tested with oil liquid). Minimum startup flow pressure required for oval gear operation: 0.5L/min. Suitable for measuring high-concentration liquids such as milk, chemicals, engine oil, detergents, and similar non-impure liquids. 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: Allow 1-3cm variation due to manual measurement. Check dimensions carefully before purchase. Color may vary slightly due to monitor display differences. Package includes: 1 x Hall Flow Sensor