Model SZ-BST Filter size(mm) 110x90x9 Viewing Area(mm) 98x40 Light state DIN.3 or DIN.4 Dark state DIN.9-13 Swith time(s) 1/25000 Delay time(s) 0.6 Power on/off Fully Automatic Power supply Solar-li.No batttery changed required Rate of UV transmittance 313nm<0.0006% 365nm<0.00006% Rate of IR transmittance 780~1300nm<0.003% 1300~2000nm<0.009% Eye protection EN379 1/2/1 Weight(g) 420g Warranty 2 years Extra functions Sensitivity adjustment small current welding Switching set for less than 20Amps TIG welding Available color Procuts with different color can be supplied accoring to customer's requirements