Easy drag measurement by yourself.You can easily measure by attaching a drag checker to the line and pulling out the line.Drag can be measured even with a lure or device set.Drag measurement can be performed with all the tools prepared or even during actual fishing.You can also measure the strength of lines and knots, and the weight of the fish you catch.In addition to drag measurement, various measurements are possible.Measurement range 0.3 to 5 kg