copy/paste from wiki......
"A 1948 study tested 58 dowsers' ability to detect water. None of them was more reliable than chance.[16] A 1979 review examined many controlled studies of dowsing for water, and found that none of them showed better than chance results.[5] A 2006 study of grave dowsing in Iowa reviewed 14 published studies and determined that none of them correctly predicted the location of human burials, and simple scientific experiments demonstrated the fundamental principles commonly used to explain grave dowsing were incorrect.[17]
More recently a study[18] was undertaken in Kassel, Germany, under the direction of the Gesellschaft zur Wissenschaftlichen Untersuchung von Parawissenschaften (GWUP) [Society for the Scientific Investigation of the Parasciences]. The three-day test of some 30 dowsers involved plastic pipes through which water flow could be controlled and directed. The pipes were buried 50 centimeters under a level field, the position of each marked on the surface with a colored strip. The dowsers had to tell whether water was running through each pipe. All the dowsers signed a statement agreeing this was a fair test of their abilities and that they expected a 100 percent success rate. However, the results were no better than chance."
Cheaper info than Rp0.5