GRAIN MOISTURE METER This digital soil moisture tester, together with cylindrical gypsum blocks, make up a system valuable in monitoring the soil moisture available to plants. Housed in a rugged ABS plastic case, features reliable temperature, stable semiconductor technology with internal battery and calibration checks. Spring-loaded binding posts allow for positive contact with the blocks’ leads. The blocks are buried in the field to monitor soil moisture changes in the area of active root growth. They are buried at one or more levels, depending on the crop, and the depth of the root zone. When the blocks’ lead wires are connected to the meter, the available soil moisture is shown on the display. The meter readings can be converted into terms of available soil moisture or soil moisture tension by referring to calibration curves, which are part of the operating instructions. Uses “ 9V” battery ( included) . Size: 2-3/ 4 " x 1-1/ 2 " x 4-3/ 4 " . Cylindrical gypsum blocks not included ( see C09023( A) N) . CSA approved.