You will find that our fiber optic Hand Held Light Source is the perfect match for our Fiber Optic Power Meter. This fiber optic Hand Held Light Source provides you with a long battery life of 30 Hours and an optional AC power supply is available. This fiber optic Light Source has an auto shut off feature that enables you to conserve battery life, and a low battery indicator provides battery status.  Multimode Fiber Optic Light Sources have LED's with a minimum output of -17dBm. You can choose continuous wave (CW) or 2kHz modulation.  ST or FC fiber optic adapters are available, depending on your needs. The fiber optic Hand Held Light Source includes operating manual, 9V battery, and a one-year warranty.