Dowsing can measure things such as:

Pendulum dowsing is the use of a weighted object on a string or chain to get an answer, usually in a yes/no format, to questions you cannot answer rationally.
The instruments I am mainly using are very famous in Romania; there’s a dedicated school people attend for years to learn to use them properly and get into the depths of dowsing. The instruments are a silver loop and a goniometer. One of my clients thought they look like a Ouija board and I think he is right. I aim to keep the information simple and straightforward on my page, but if you’d like more details, please feel free to ask and I will answer in the same day or the next.