Description: Exquisite and professional workmanship makes it very sturdy and durable. A variety of different power allows you to choose according to different work needs. The strong light source and strong penetrating power make it easy to penetrate 10Km fiber. And the rotatable protective cover allows the switch to be protected. Made of aluminum alloy material, it is very durable to use. The length of this product is 17.5cm and the width is 2.4cm. It is suitable for SM/MM Optical Fiber. And it can search for fiber obstacles, connector detection, etc. Item Name: Probe Pen Material: Aluminum Alloy Applicable Fiber: SM/MM Output Wavelength: 650±10nm Output Optical Power: 1/10/20/30mW Battery Type: 2 x AA Batteries (Not Included) Features: Strong Light Source, Fine Workmanship, Non-slip Working Temperature: 0 Degrees Celsius -60 Degrees Celsius Storage Temperature: -20 Degrees Celsius -70 Degrees Celsius Size Details: Size: 17.5cm x 2.4cm/6.89" x 0.94" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Probe Pen