Moisture Sensor Supplier Moisture Sensors for fresh Concrete & Aggregates. The SONO sensors are not your Father’s microwave moisture sensors! The on-line SONO sensors measure the moisture of construction aggregates and fresh concrete, are designed to be installed below a hopper, on a weigh belt or directly in a mixer and interface to a batching or control system. The portable SONO-WZ determines the water content in fresh cement, on-site, in minutes. The HD2-Kit for moisture values of sand, gravel and stone.