Spring balancer load capacity

The spring balancer is divided into two types:load balancer and light spring balancer. The two tools balancer look different from one another.The spring balancer is round,the light capacity spring balancer is flat. The wire quality of the two spring tools balancer is the same. The wire of load balancer will nor break when headle the weighe wihtin capacity range. The wire is regularly wound around the retractor,the wire winding can be clearly seen on the back of the spring