Versatile Functions: The TM290 Smart Handheld OTDR Optical Fiber Tester features multiple essential functions including OTDR capabilities at 1310/1550nm with a dynamic range of 22/20dB for distances up to 60km. Precision Measurement: This Optical Fiber Tester offers precise measurements with an Optical Power Meter range of -70~+10dBm or -50~+26dBm and a Visual Fault Locator with output power greater than or equal to 10mW. User-Friendly Design: Designed for ease of use, the TM290 Smart Handheld OTDR features one-key operation and clear test data display. Robust and Portable: Built for field maintenance work, this Optical Break Point Obstacle Finder is lightweight, dustproof, waterproof, and quakeproof. Long-lasting Performance: Equipped with a high-capacity 4400mAh lithium-ion battery, the TM290 ensures long working hours, capable of performing over 5,000 measurements.