... used in optical communication, optical components measurement, fiber optical sensor and other fields. Features1. Optional auto-shutdown ... . Maintenance CATV3. Test Lab of Fiber Optic4. Optical fiber sensorsSpecificationsType BD271A BD271BWavelengthnm 650nm 635nmEmitter TypeFP- ... 15Modulation FrequenciesCW2HzPower SupplyAAA 1.5V(3pcs batteries)Fiber TypeSM,MMworking time(h)40Operating Temperature()- ...