-> It looked a lot less impressive in person.

-> I don't see how it's going to decide that the voltages are good,  etc. unless
-> there's a lot more in that little box than they let on.  Basically what it said
-> on it was to disconnect all of the other loads (I guess meaning drives, etc.)
-> and connect the tester,  apply mains power,  and push the button.  If the green
-> light comes on it's "good".
-> I dunno,  even though it wasn't all that expensive I don't think I'm inclined
-> to get one.  

 IF you deal with amny Power Suplies you are foolish for passing o nit.
And simple solidstate Threashold switches to turn on LED's at a
predetermined voltage are easy and cheep to produce. 
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