TEKNK-107 WELLHISE AC10 CONTACT-FREE VOLTAGE DETECTOR is a device used to quickly and reliably detect the presence of electrical voltage. This device is often used in various applications such as electrical maintenance, repair and safety control. The AC10 model has a contact-free operating principle, i.e. it is not necessary to touch wires or conductors to detect electrical voltage. Instead, the device gives audible and/or illuminated warnings when it is brought close to electrical wires or held in an area where an electrical field is present.