UT13A/B is a non-contact inductive electroprobe. It is of new appearance, safe, reliable and high sensitive. The AC voltage induction range of UT13A is from 24V to 600V. The AC voltage induction range of UT13B is from 50V to 1000V. It is applied to judge whether conductors are conductive. It is not only the necessary inspection tool of factory and home but also smelting, electron, communication, manufacture, fossil oil, national defense, electric power, chemical engineering and colleges. It is the ideal tool of maintaining circuit and electrical equipment.