Metal detectors are used all over the world to detect the presence of metals in people, cargo and ground. Hence, they can be effectively used in geological research, archaeological exploration, recovering metallic items and security maintenance. Government buildings, hotels and airports are some places that use metal detectors. These detectors can be classified based on their performance. The performance of the detector is determined by the quality of its parts. The better ones have two directional system, consistency, low false alarm rates and better target selection. Some of the more popular ones have shielding panels that are made of aluminum. This improves handling and sensitivity. Walk through metal detectors that are portable are the best ones. They do not require any initial calibration and can be operated easily. Another advantage is that they are lightweight. Good quality walk through types are available in the market in the price range of $3000 to $6000.