Thanks Ted. I have just such a voltmeter (and one on the dash courtesy of GM - full instrumentation in a truck!) but as the ciggy socket is permanently live I'd use it more as a tool on the truck and at that I'd be as well open the bonnet and use the Fluke. I did have it in the smart permanently though (as the socket only energised with ign on) and it was useful. Mine doesn't have the USB provision but I have another thingy for that.
Key to sorting all of this out though was the info on the (fuse blown!) Fluke. For that, your advice was invaluable - thanks.
Key to sorting all of this out though was the info on the (fuse blown!) Fluke. For that, your advice was invaluable - thanks.