Google isn't being very helpful......it may be that I'm using the wrong keywords. Here are my questions: I'm looking for a device similar to a multimeter that measures amperes and can be plugged into a computer. On the computer, the software needs to provide a graph of the current draw so I can watch it fluctuate in real time. It would also be nice if it calculated things like "RMS" or any other relevant quantities . I have found multimeters than can be connected to a computer, but they only measure up to 10 amps. The various devices I'm connecting to it may draw more. Any help would be appreciated.