... -site workinjury apparatus, to extend the service life;3) Pointer slider with external spring ring structure, bothconvenient for the friction ... adjustment, and ensures that thepointer shaft and pointer slider friction uniform, to ensurethe accuracy of the instrument. Peer ... 207J(0.225Kgf.m)Spring extension:75mmThe static friction of pointer slider:0.5N±0.8NRadius of spherical tip :25mm± ...