To measure a deep well, upto 200m, which one is better, a water level meter or a submersible level sensor, cost and accuracy considered mostly?

 

What is a "water level meter"? What kind of technology does it use?

 

in the old days, the water level was detected when the bucket brought up water

 

I think you can come to your conclusion on this one.

 

What is a "water level meter"? What kind of technology does it use?

It is a portable level probe with extra tape reel that is graduated

 

in the old days, the water level was detected when the bucket brought up water

Yes, that's true