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By certification 
0-60V/0-2A Variable adjustable dc power supply
FAQ
Q:What the certifications do you have for the bench power supply?
A:We usually have CE and ROHS.
Q: I don't know how to operation the bench power supply, where should i get a help?
A:You can contact us directly, then we will take a video to you to help you.
Q:Could i visit your factory when i come to China?
A:Yes, of course. we will always welcome to you to visit our factory.
Q:What about the advantage of the linear mode dc power supply?
A:The most obvious advantage is less ripple and low noise then the switching power supply.
http://www.lwpowersupply.com/
