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The WTP4501 Test Pencil is an essential tool for electricians and anyone working with electrical circuits. It is designed to detect AC voltage between 12 and 300 volts, providing quick and accurate readings for safety and troubleshooting. This test pencil helps distinguish between live (phase) wires, ground, and can also identify breaks in the live wire. The LED indicator lights up or changes color to signal the presence of voltage or to identify the type of line detected. Powered by a single LR03 AAA battery (included), it offers simple operation, making it easy to use when checking electrical circuits. The pencil also features a safety clip, allowing for convenient carrying during work. It comes packaged in a color box, making it ideal for retail sale and storage.