Hand held Metal Detectors like Garett scanners can detect medium-sized pistols at 9 inches; large pocket knives up to 6 inches; razor blades at 3 inches and a hat pin at 1 inch. The Metal Detectors has automatic retuning and battery check.
Garrett has a Super Scanner which will alert you to even the smallest concealed metal weapons, using both an audio signal and a visual alarm.
Garrett has an Enforcer G-2 which is compact and lightweight and will fit into a shirt pocket.
Hand held Metal Detectors like Pro-Scan Scanners are a high performance detector designed to meet the exact requirements of the security industry.
Pro-Scan Scanners can detect a 38 Caliber hand gun at 7.75 inches on low sensitivity and 11 inches at optimum sensitivity. A pen knife is detected at 4 inches on low sensitivity and 6 inches on optimum sensitivity. A razor blade will be detected at 2 inches on low sensitivity and 4 inches on optimum sensitivity.
Pro-Scan Scanners will indicate metal presence by an audio warning tone and a red light comes on.
Pro-Scan and Pro-Scan II are usually used in crowd control, airport and border security, checking parcels and letters for metal objects and anywhere that hidden metal needs to be detected.