capacitive soil moisture sensors

Capacitive soil moisture sensors use the soil's dielectric permittivity to estimate water content—no gypsum blocks to dissolve, no needles to polarize. Kingmach's sensors take that principle and wrap it in a package that survives real trench conditions. The probe body is sealed to IP68, and we pay attention to the small things: the transition from cable to probe, the surface finish that resists mineral buildup, the circuitry that ignores stray capacitance from long cable runs. You can spec them with SDI-12, RS485, or a simple 0–2.5 V analog output. For researchers, we offer a calibration service where you send us a few kilos of your soil and we tune the sensor's curve to match. In one vineyard project in clay-loam, that cut the error from ±5% to under 2%. Standard models cover 0–50% VWC with ±3% accuracy; extended-range probes go drier. If you're putting sensors into a landslide-monitoring network, we can build armored cables and rugged connectors that survive being buried for a decade. And when the first one fails—because eventually, everything does—we'll have a replacement out quickly through our distributor network. No long downtimes, no orphaned data sets.