The Tramex Concrete Moisture Encounter is a non-invasive meter which is placed directly on the surface to measure moisture in concrete, sand/cement or gypsum screeds. It is used in the flooring and other industries where it is important to know the moisture content of concrete before a coating or covering is applied. The Concrete Moisture Encounter operates on the principle of non-destructive impedance measurement. Parallel coplanare electrodes fitted with spring-loaded contacts are mounted on the base of the instrument. During operation, a low frequency signal is transmitted into the concrete or floor screed to measure the change in impedance cased by the presence of moisture.