This gizmo has helped me a lot, especially for current measurement on USB
I have the two first, and use them frequently
http://www.ebay.com/itm/1PCS-OLED-USB-Ch...2edf8c7852
http://www.ebay.com/itm/LCD-USB-Charger-...8103&rt=nc
http://www.ebay.com/itm/Tester-Power-Det...2ed37a2d33
I have the two first, and use them frequently
http://www.ebay.com/itm/1PCS-OLED-USB-Ch...2edf8c7852
http://www.ebay.com/itm/LCD-USB-Charger-...8103&rt=nc
http://www.ebay.com/itm/Tester-Power-Det...2ed37a2d33