I use coat hangers. Works really good for me. I find graves. Then you can find out if it is a man, woman, or a child. Going to try then on other thugs, can't wait.
You can influence the direction and amount the rods rotate by exerting pressure on the stub ends and by not keeping the top or swing arms level. To help me to NOT inflict pressure I normally use stiff straws from a slushy machine or McDonald's and insert the stub ends in them.
I've found that I get more accurate results by keeping the tips of the rod(s) lower than the bottom of the handles. So that the rods must react against gravity, prevents chance of false readings that way, especially on windy days.