1All-metal optical fiber red light pen 30 km, high-quality laser chip, adopt aluminum alloy material, more suitable for special outdoor environments 2The pen body adopts anodizing technology, which is not easy to change color and fall off. 3Button protection layer, 360 rotation, to avoid operating errors, packaging keys are not damaged 4Including constant light, fast flash and slow flash three working modes to meet multiple needs 5Suitable for SC, ST, FC interfaceItem Type: Optic Fiber Fault Locator Output Optical Power: 30mW Working Temperature: 10-60 (without condensation) Storage Temperature: -40-85 Applicable Fiber: Single-mode, Multi-mode Shell Material: Aluminum alloy Output Wavelength: 650 10nm Power Supply: 2 x AA batteries (without battery) 1 xOptic Fiber Fault Locator1 x Cover2 x Core1 x User Manual