Features 10N Bar Box Spring Dynamometer dynamometer for school teachingFatigue spring with excellent measurement performance can be pumped move elastically scale plate put the ring pointer rod and plastic housing composition Before use you need to zero If the scale is not accurate you need to adjust the stiffness coefficient Zeroing is divided into horizontal zeroing and vertical zeroing Scale value 1kg 10N min scale 0 2N Specification Material Metal PlasticMaximum range 10NMinimum scale 0 2NSize 150 20 35 5mm Package includes 1 10N Bar Box Spring Dynamometer