The moisture content in agricultural products will affect the quality. Fungi development happens if the moisture content is not optimum. This paper presents a non – destructive, simple, fast and low cost interface circuit to measure the moisture content of paddy grains heated in different temperature. The arrangement used is a high precision impedance converter. Ceramic capacitors of different values were used to check the measuring circuit. Using this circuit, moisture content of representative standard samples was measured and dielectric constant was calculated. The paper discusses the principle, technique, methodology and experimental set up used and the results obtained. © 2018, Gazi University Eti Mahallesi. All rights reserved.