I have a wooden roof.
I need to drill though it from above, and hit the beams exactly in order to attach something.
The edges of the roof are not straight, and it is impossible to find out where the wooden roof begins, so using a tape measure to find the beams will be extremely difficult.
Does modern technology provide a tool with which I can find the position of the beams through the roof?
I'm thinking about a two-part gadget where one part can tell when it is close to the other part or something.
The roof is about an inch thick.