Abstract: A probe for use in sensing moisture content of bulk grain or other granular material comprises a cylindrical tube, for example of plastics, having a tapering nose, and having adjacent said nose first and second electrical conductors wound helically around the tube so that the turns of one conductor are spaced from, and alternate with, the turns of the other conductor. The conductors are electrically insulated from one another by the plastics tube but are exposed on the surface of the tube, or project slightly from such surface, for direct electrical contact with the granular material. The conductors extend through respective apertures in the plastics tube and are connected within the tube to respective insulated conductors extending to electronic measuring circuitry within a handle of the probe.

Abstract: An apparatus for providing an atmosphere of predetermined humidity comprises a chamber 10, a source 22 of dry air, leading to the chamber 10 directly via a valve V3 and a saturator 20 having an inlet connected with the source 22 and an outlet connected with the chamber 10 via a valve V1. An outlet from chamber 10 is connected via a valve V2 with an extractor, whereby with valves V2 and V1 open and valve V3 closed, saturated air can be drawn into chamber 10 whilst with valves V2 and V3 open and valve V1 closed dry air can be drawn into chamber 10, to adjust the humidity in the chamber 10 in either case. A relative humidity sensing probe 12 and a temperature sensing probe 14 within chamber 10 pass signals to a computer 24 which controls valves V1, V2 and V3, whereby feed-back regulation of the humidity in chamber 10 can be achieved.