Feature: 1. The pen‑type red light source uses a 650nm semiconductor special laser as the light‑emitting device (not ordinary LED), and is driven by a constant current source to emit a stable red light. 2. Enter the single‑mode (or multi‑mode) fiber with the optical interface connection port, and find the light leakage or bending point by observing the red light overflow point, and realize the fiber fault detection function. 3. Thicker aluminum alloy material, the pen body is made of aluminum alloy, which has good oxidation resistance and long use. 4. Applicable to various optical fiber interfaces, standard 2.5mm interface, applicable to any interface of FC ST SC. 5. The light source has strong penetrating power and can easily penetrate the red light pen with super stable optical fiber performance. Pulse continuous wave, quickly locate the fault breakpoint. 6. It is an indispensable tool for optical fiber engineering construction, optical fiber network maintenance, optical device production and research. Specification: Item Type: Red Light Pen Material: Aluminum Alloy Color: As shown in the picture Product Model: TL532 (10mW) Red Light Output Power: >10mw Light Source Wavelength: 650nm Use Optical Fiber: SM, MM Maximum Theoretical Test Distance: 1 5km Power Supply: 2 x AA batteries (not included) Continuous Working Time of Red Light Source: more than 20h Working Temperature: 0 60 celsius Storage Temperature: 20 +70 celsius . Package List: 1 x Red Light Pen (Battery Not Included)1 x Portable Bag1 x Instruction Manual Note: 1. Generally, the higher the temperature, the shorter the laser life, so try to avoid high temperature working environment when using. The fiber head is cleaned when the laser is working.2. When the light source is not in use, please cover the dust cap to prevent dust from falling into it.3. The battery should be removed when not in use.