Four Point Probe Heads:

Signatone manufactures four point heads for resistivity measurement applications. The SP4 Four Point Probe Head is made from mold-injected Delrin and is designed for use at room temperatures.

The HT4 model is machined from Macor, a ceramic like material, and will withstand temperatures up to 400°C. The two heads are available with a variety of probe tip spacings, spring pressures, materials and tip diameters. The four tips are in a straight line configuration, however, square pattern probe heads are available on special order.