I've several power adapters of cellphones/routers/modems etc lying around at home. I want to find out if they're any good, however I don't have the right devices (cellphones/modem/router) to check them with. I only have a voltage tester: http://www.royalmaster.com.co/wordpress/wp-content/uploads/2012/06/fer6-1024x768.jpg I know this voltage tester can't determine what I want to accomplish, but just for fun I put it on the tip of my Nokia cellphone's working power adapter (connected to a power source) and as expected it didn't do anything. I'm looking for something economical to show me volts/amps etc. when I put it on the tip of these adapters. Thanks in advance!