The SONO-M1 Aggregate Sensor from Imko, Germany uses Trime Domain Reflectrometry (TDR) to determine the moisture content of aggregates. It is very accurate and quickly shows results. The handy two-rod probe measures moisture in sand, gravel, expanded clay spheres and other aggregates. Moisture measurements can be displayed using the Hand-held SONO-Dis Read-out Meter or the Pico HD2 Meter.
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