The tungsten needle with the tip that sharpened tungsten needle is mainly used for the instrument probe using. Such as digital four probe tester, the device is a multi-purpose measuring equipment using four point probe measurement principle.

The tungsten needle non radioactive material. Electron emission ability is the thorium tungsten high, low arc voltage, arc stability. The positive polarity, the allowable current density ratio of thorium tungsten high 5%-8%, AC allowable current density is high, long service life, suitable for DC or AC electric welding, and the use of the same amount of time in case of longer than thorium tungsten. Usually used for welding carbon steel, stainless steel, titanium and other metals.