Feature: 1. Portable Stability: TL512 handheld stable light source optical power meter with single mode 1310 1550nm, fixed SC connector. Ideal for telecom and cable TV maintenance testing. 2. Stable Output: Handheld light source with high stability output power and 3 modulation frequencies. Output wavelength of 1310 1550nm with SC connector for SM or MM fibers. 3. Drop Safety: Blue soft rubber protective layer on the exterior to effectively prevent damage from drops or collisions. Features a 2.5mm universal interface including SC connector. 4. Versatile Testing: CW, 270Hz, 1KHz, 2KHz sound carrier frequencies. Battery operated with 3 x AAA batteries (not included). Storage temperature ‑20 to +70℃, working temperature ‑10 to +60℃, relative humidity 0 to 95%. 5. Quality Design: Made for durability and reliability. This optic fiber tester is designed for easy handling and accurate testing, ensuring efficient maintenance and troubleshooting for fiber optic networks. Specification: Item Type: Fiber Optic Tester Material: ABS Output Wavelength: 1310, 1550nm Output Power: ≥-7dBm Connector Type: SC Fiber Type: SM or MM Sound Carriers: CW, 270Hz, 1KHz, 2KHz Battery: 3 x AAA Battery (Battery not included) Storage Temperature: Approx. -20 to +70℃ / -4 to +158℉ Operating Temperature: Approx. -10 to +60℃ / 14 to 140℉ Relative Humidity: 0 to 95%. Package List: 1 x Power Meter 1 x Carrying Case 1 x User Manual