I bought a $3.99 wand/coil off ebay.
Worked a treat. It turned both my monitors Red.
Then after a lot of trial and error, holding it 90 degrees/0degrees, on off, moving it in circles, ovals , squares, triangles, I got both my monitors the right colour.
I would love to be shown how to use it properly. I suggest buying a $5 off ebay and then spending the $30 to get a tech to do it in front of you and teach you.
Just take a look at the ebay one and make sure you get the 110V or 240V one that is right for your country. I was lucky my cab has a spare 110V output so I plug it into there as we work in 240V here. I believe if you put the wrong voltage through an electromagnetic coil it changes the magnetic flux profoundly.