(1) Be capable of being duplicated by anyone who follows the appropriate steps.
(2) Be devised in such a way that the tester can not possibly manipulate the results (whether intentionally or otherwise).
To date, no claim has been found to be verified by a strict following of the steps outlined above.
Additionally, those who claim supernatural help in performing the practice of dowsing is considered divination or spiritism - a practice which is strongly condemned in the Bible. If you wish to follow the Bible, then you cannot do such things.
For much more, see
Dowsing
Practices That God Hates - #5 Magical Spells and Spiritism
Dabbling in the Occult - What's the Harm?