Join Date: Nov 2000
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How to make and use a Leadline
I believe the ones that you will see commercially available use either a 3 or a 7 pound lead weight, and fairly light line.
Depending on the water you are going into, fairly calm versus fairly current affected, you would want to have a weight heavy enough to make it to the bottom and stay there long enough for you to get a valid reading.
You might want to use rode depth indicators or knots to indicate depth.