steel ball. This Professional Hand Held Metal Detector is widely used in important and public places like airports, industrial zones, government buildings, schools, hospitals, meeting places, sports and many other places for security use. And you will hear prolonged sound when objects were measured, while you will hear short sound when small targets were measured. Besides from -10 ℃ to 50 ℃ it can work normally.
Another advantage is that since the size of this device is small, the weight is light, so this handheld metal detector is easy to carry. In addition the rechargeable nickel-based batteries can be used as a separated power supply. In a word not only at the price, but also from the quality, this handheld metal detector is worth to buy. Come here and add one to your chart.
Power Supply:9 volt battery (6F22ND)
Quiescent Current:<5.1mA Operation Current:Audio and LED<20mA ,Vibration<70mA