The GDLS 360 is a pocket sized Dual Laser Source (1490nm and 1625nm) representing the latest design in stabilized, NIST calibrated light sources for accurate loss measurement on single mode fibers. The GDLS 360 provides a 2KHz tone output for fiber identification when used with the GRP400 series Optical Power Meters. Features a single mode application. Provides a stable light source. It is also adaptable - it interfaces to all industry standard connectors. The GDLS 360 comes with an SC adapter. Other common connector types are available but sold separately - SC, FC and ST as well as hybrid cables for connection to other connector interfaces. Specifications: wavelength of 1490nm, 1625nm Laser, output power of -4dBm Typical, laser classification: Class 1 (FDA 21 CFR1040.11), output stability of +/- 0.05dB, 1 hour, + /- 0.03dB long after 15 minute warm-up, spectral width of 5nm/5nm, tone output of 2kHz, operating temperature of -10C to 50-degrees C, storage temperature of -30C to 60-degrees C. Features a push button on and automatic shutoff. Dimensions: 6.1 by 0.94 by 0.75in (15.5 by 2.38 by 1.90cm). Weight: 3-ounces (85g). Made in the USA.