sensor77Performance Analysis of 77 GHz mmWave Radar Based Object Behavior. Arsyad R. Darlis, Nur Ibrahim, and Benyamin Kusumoputro . Department of Electrical Engineering UniversitasMetal Sensor - 77-445 Advanced metal selector can set to detect rebar, iron pipe or copper pipe Metal depth can be determined to a depth of 75mm (+–7mm accuracy) LCD displays Senses