i have started to use party balloons. 3 inch I think is the size. knot them to the leader. You can fill them to float any amount of weight. You can watch the weight jiggle the balloon the bottom. I think they are the most sensetive indicator I have used. $2.00 per 100 balloons and many colors. They don't ice up either. Try them if you don't like them give them to the kids.
Sheldon