I use a KillaWatt device. It is a simple device you plug into the outlet and then plug the device you want to measure into it. I've had mine for a long time so I have no idea what a new one would cost, but I'm guessing sub $30.
I use a KillaWatt device. It is a simple device you plug into the outlet and then plug the device you want to measure into it. I've had mine for a long time so I have no idea what a new one would cost, but I'm guessing sub $30.