I have been trying to find an ammeter that can perform a specific task and failing miserably. I would appreciate any help I can get. and as you may soon notice, I have no engineering background. I am trying to find a non-invasive method for measuring the current generated in an electrosurgical unit (ESU) - the device that powers a bovie electrocautery device. The device changes voltage to keep power constant, depending on the amount of current passing through the a patient (resistance is constantly changing). The current that is used is in RF frequencies (350kHz-4MHz), to limit the effects on heart electrophysiology, and runs between 200-1000mA. I need a clamp on device that can be connected to a computer to give me real time measurements of the current while the bovie is in use. I cannot find an ammeter that will operate in RF frequencies and within those parameters. Does anyone know of a device commercially available that can do this? Does this type of device have to be custom built? I would appreciate any help I can get... thanks.