Welcome to our store! Made of high-quality material, solid and durable to use. Stable performance and good using effect. Professional manufacturing, exquisite workmanship, high reliability. The outer diameter of the optical fiber is 2.2mm, the inner diameter of the optical fiber is 1.0mm. Probe thread size is M3, can meet the corresponding installation requirements. Features: Made of high-quality material, solid and durable to use. Stable performance and good using effect. Professional manufacturing, exquisite workmanship, high reliability. The outer diameter of the optical fiber is 2.2mm, the inner diameter of the optical fiber is 1.0mm. Probe thread size is M3, can meet the corresponding installation requirements. Specification: Item Type: Fiber Optic Sensors Model: PT-310 Induction Method: Light Sensing Optical Fiber Outer Diameter: 2.2mm Optical Fiber Inner Diameter: 1.0mm Probe Thread Size: M3 Line Length: Approx. 1m / 3.3ft Package List: 1 * Optical Fiber 4 * Nut 4 * Anti-Slip Gasket Note: 1. Please allow a little error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will give you the best solution!