Auto-Darkening Welding Helmet ideal for electric welding, argon arc welding, gas shielded welding and tinsoldering, etc Auto-Darkening Welding HelmetVRKM8000-1Technical parameters:Light state: ... (s): less than 1/25,000 (bright to dark at room temperature)Delay time (s): adjustable 0.15 ... of advanced circuit able to make the welding light fast become dark.4. Constant protection for both ultraviolet ...