The technique specification and excellent function:
☆The Comfortable Looking, light and handy and
☆convenient.
☆High inductance and instruction design precision
☆There are two choices to adjust the inductance
☆height
☆Use two pieces of 1.5V battery; retrench the power
☆and easy to change.

The style of exploration: induce by magnetism
The sensitive degree of exploration: if one metallic pin (dia.0.7 and length 25mm) on the surface of exploration, the lowness of sensitive degree is about 20-30mm, the highness of sensitive degree is about 30-40mm.
The adjustable induction degree: with low&height two positions
The exploratory surface: 5x2.5cm
The style of alarm: buzzer or radiation tube
Power: two pieces of 1.5v alkalescent battery
Dimension: 16cm(length) X 5.5cm(width) X 4.5cm(height)
Weight: about 200g