A new type electrode adopted for plaster of paris soil moisture blocks consists of stainless steel 20-mesh screen 15/16 inches long, 4/16 inches wide, and placed vertically 3/16 inches apart. This screen type electrode constitutes a very important improvement in the blocks. The plaster becomes enmeshed in the screen to produce a reinforced multiple contact between the electrode and the casting, which ensures more stable performance than that of the original blocks, which were made with straight wire electrodes. The new blocks become sensitive to change in soil moisture content at a tension ranging from about 260 to 330 cm of water. The new plaster of paris blocks with the screen type electrode begin to measure soil moisture, therefore, at about field capacity.