． Q1.Why you need PC lens for Safety Spectacles?

． Q2.What is UV light? Does our spectacle provide UV protection?

． Q3.What is E,C,G, type I,typeII marking on safety helmet?

． Q4.Why auto darkening welding lens operate unconsistantly when welding?

． Q5. How to close the welding lens shade?

． Q6.What is OEL, PEL, MAC & TLC stand for ?