soil moisture sensors

Soil moisture sensors from Kingmach measure volumetric water content using proven capacitance or TDR technology, depending on the model. They are built into sealed, corrosion-resistant probes that can be left in the ground permanently or used for spot checks with handheld readouts. Standard units output analog voltage, current loops, or SDI-12, which makes them straightforward to connect to most data loggers. Probe length can range from 10 cm up to a meter or more; longer versions are often used for slope monitoring or landfill covers where the moisture profile matters at depth. The stainless steel or PVC body resists typical soil chemistry, and the electronics are potted against moisture ingress, which is a common failure point on cheaper sensors. We focus on practical field performance: minimal drift over a season, fast response to wetting fronts, and low power draw for remote sites. Custom orders are normal for us—you might need a specific thread type for a borehole installation, or a ruggedized cable for a highway cut. Our engineers check the specs against your site conditions and advise on sensor placement, sampling frequency, and power. The sensors ship from our factory with calibration data and installation kits. For long-term projects, we keep design files and can supply identical units years later, which matters when you’re maintaining a monitoring array over a decade.