It can be place on the ground or elevated  so the ball can pass under the stick.

4-foot putts are extremely crucial for every golfer.
Place the tool on the hole as shown in the photos exposing the side of the stick with the green stimp, place the ball 4 feet away from the holeand then based on the lateral slope aim at the corresponding indicator (the three black bars printed I or II or III) 1%, 2% or 3%.
Alternatively, if you do not know the slope, choose the indicators in sequence and you will discover the slope based on the result (hole made or missed).

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