[TheForge] Cheap Autodarkening Welding Helmet.

[theforge@mailman.qth.net]

I had heard that before.  What I am curious about is how can you tell 
that it is in fact blocking the UV?   I generally don't trust cheap 
tools from Harbor Freight(or elswhere)  and generally inspect and test 
them to the debree that I can on the odd occassion that I buy any these 
days.  So how does one test the UV permeability of a lens?  I can tell 
it is stopping the visible spectrum alright, but outside of that is 
there an easy way of verifying?   Regarding the sensitivity of the auto 
feature, it had two switches that adjusted sensitivity (high and low)  
and speed ( fast and slow).   I used it in the high/fast setting as the 
other settings were nothing like my sellstrom that I have gotten used 
to.   On the high sensitivity setting it tends to darken even on 
sunlight reflected off the bare metal, but I would rather that than the 
alternative.

Charles

Darrell wrote:

>It is not the speed of darkening that blocks the UV rays, nor the shade that
>it darkens to. The material that the lens is made from is what blocks the
>UV. Even if the lens failed to darken, your eyes are protected from the
>harmful rays.
>Darrell
>  
>