The Sun Telecom sun-ls200 is a handheld variable light source designed for fiber optic measurement, offering stable output power and wavelength identification for testing optical loss in both single-mode and multimode fibers. It features a long battery life, high precision, and multiple output frequencies, making it suitable for various applications including telecom maintenance and optical fiber testing laboratories. The device is compact, rugged, and operates within a temperature range of -10 to 60°C.