none

it exists

Don't ever purchase from this company. Their customer support is non-existent, just another group of guys in suits trying to make money off of us. Cheap cookie-cutter outsourced CRAP. Buy American or suffer the consequences. These people will not help you if something fails. They should not be allowed to sell in this country, and perhaps the Better Business Bureau will help in that regard. DON'T DO IT.

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Hadley, Atomlab