Which instrument is commonly used to measure deep percolation within a soil profile?

Explanation

Deep percolation, which refers to the movement of water downward through the soil beyond the root zone, is typically measured using a lysimeter. This device helps quantify the amount of water that percolates deep into the soil. Hydrometers measure liquid density, thermometers measure temperature, tensiometers measure soil water tension, and barometers measure atmospheric pressure.