Precise, ultra-light and handy Spring Dynamometer with transparent tube and long, clear double display. Patented tare, zero-adjustment and spring suspension technology. Free turning inner tube which neither influences reading nor tare. Tare screw with incremental rotation, to avoid inadvertent adjustment. Corrosion-free components. Always ready for use, needs no batteries. A time-tested original Swiss quality product at an excellent price-performance ratio.