FSM-6000LE鋼化玻璃表面應力儀的 專用光源FSM-LED590 FSM－LED590 lamp kit for FSM-6000 FSM-LED590 is LED lamp kit for surface stress meter. Target model:FSM-6000 It is designed for the surface stress meter instead of current sodium lamp. It can exchange to the new lamp by oneself. If you have other model,please ask your agency. Accessory: tool, diffuser, new label ,manual Specification Central wave length:590 +/-10nm(correct value is written on unit) Full width at half max:2nm