Dowser
/ˈdaʊzər/
Definition 1 of 2
Pro Tip 1/3Historical Craft
Dowsing is seen as an old-fashioned technique, often viewed with skepticism. 
The old dowser claimed he could find water like his ancestors did.
Pro Tip 2/3Skepticism Common
Many people doubt dowsing's effectiveness, so using the term may imply belief in disputed methods. 
Despite the doubts, the hired dowser began his search for the underground spring.
Pro Tip 3/3Specialized Term
Not a word everyone knows, 'dowser' may confuse those unfamiliar with the practice. 
The children watched, fascinated, as the dowser searched for well water on the farm.