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Electron Microprobe Lab, University of Minnesota

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I'd like to purchase additional welding googles for use while coating  
specimens in our new vacuum evaporator (via thermal evaporation using  
sharpened carbon rods).  I have one old pair of welding googles, but I  
have no idea what shade they are (they don't appear to be labelled).   
Does anyone know the minimum shade value for this purpose?  5?  10?   
15?  Something in-between?  I and other researchers in the lab enjoy  
seeing, so I'd like to choose the right shade.

Thanks,
Ellery

--------------------
Ellery E. Frahm
Research Fellow & Manager
Electron Microprobe Laboratory
University of Minnesota - Twin Cities
Department of Geology & Geophysics
Lab Website: http://probelab.geo.umn.edu
Personal Website: http://umn.edu/~frah0010