WGI210at and WGI210it are identical in function, only the temperature and width are different. The 210AT is 0℃ to 70℃, and the 210IT is minus 40℃ to 85℃. We have met a suspect that WGI210AT has been renovated into WGI210IT, but we don't know how to verify it. Is there any way for the original factory to verify this product? Is there any material for the font?