Silverline In-Car Inverter
This one is our pick of the one-piece units, but will only suit depending on where your socket is positioned in car. The plug section is hinged, but movement is limited and the inverter is relatively bulky. If you are able to use this, it is a neat solution with no wires. Output was good and when it became overloaded it restarted immediately. It powered all our test kit, only giving up when we tried all five together.