We looked high and low for a low EMF emission PS2 computer mouse. We finally located a limited supply of these brand new, but older model ball mice. Testing with a Trifield meter revealed no measurable emissions on magnetic or electric field settings!
Old style ball for detection of movement, so no high emission optical electronics. Will plug and play on many computers (not Apple). Style and color may differ from image, depending on what we can get our hands on. Add the USB adapter (below) if your computer does not have a PS2 (round) port available.