welding helmet

LIGHT STATE: DIN4
DARK STATES: DIN9-13 ( Stepless Regulation))
SWITCHING TIME: (Light to Dark) < 1/1,000S at Room Temperature
(Dark to Light) <0.1-1S (Automatic)
DELAY TIME: As Buyer's Option(WH4500A):
Slow: 0.6S∼0.8S Fast: 0.1S∼0.3S
Sensitivity adjustment: As buyer's option (W4500A): LOW/HIGH
BATTERIES: Li-Mi & Solar Combination
(Min. Lifetime: 3000 Welding Hours)
OPERATING TEMPERATURE: -5oC----- +55oC
VIEWING AREA: 90 X 40 MM (3-1/2" X 1-2/3")
SIZE OF FILTER CARTRIDGE: 110 X 90 X 10MM (4-1/3" X 3-1/2" X 1/3")
RATE OF ULTRA-VIOLET TRANSMITTANCE: 313 NM < 0.00006%
365 NM < 0.000061%
RATE OF INFRA-RED TRANSMITTANCE: 780-1300 NM < 0.003%
1300-2000 NM <0.009%
WEIGHT: 490G (1.08 Pound)
MATERIAL OF HELMET: Nylon