Dear Sir, This is David Lee who marketing and sales director of Tae Young Optics Co., Ltd.(TYO).TYO KOREAN optical company. TYO have experienced making UV-IR cut off filter for Auto Welding Darkness Cartridge.And now suppling the to Helmet ...

provide digital car compass、Handheld digital compass、gas sensor：CO、CO2、H2S、H2、SO2、NH3、CL2、CH2O、O3、02、NO、NO2、HCL。