With drag checkers, you may set appropriate drag force and eliminate line breaks. This Bouz drag checker measures line tensions just by hanging the drag checker on line, between reel and the first guide. And you may see the drag force by yourself. Drag checker has a max record hand and you may check the max reading later. You don't have to ask someone to read the drag force at the end of lines. This is the must for serious anglers.
You put lines between the three cones on the drag checker, and the center cone will be pushed by load to measure line tensions.
About 30% of line breaking strength is said to be appropriate drag force. All measurement is by metric KG.
DC-2001 up to 1kg
DC-2003 up to 3kg
DC-2005 up to 5kg
DC-2015 up to 15kg