Pro3000 Tone Generator and Probe Kit, SmartTone Technology, Handheld Telephone Line Circuit Finder Enhanced durability: This cable tester is made of high-quality materials, designed for long-term use with resistance to wear for reliable performance. Accurate and reliable testing: This cable tester provides high accuracy, ensuring safe and dependable testing of telephone and local area network cables, making it an essential tool for electricians. Easily identify wire pairs: Utilize SmartTone technology to identify correct wires. When the remote end of a short-circuit cable is paired, the tone rhythm changes, allowing for easy and accurate wire identification. Intelligent function for precise pairing: Use the SmartTone function of the Pro3000 analog audio generator to accurately identify and pair wires. This intelligent feature simplifies the cable troubleshooting process. Unique tones for easy identification: With SmartTone technology, hear 5 different tones through the probe. Easily identify and match specific wire pairs, saving time and effort during cable testing. Color: As shown Material: Plastic Package Contents: 1 set x Circuit Finder Note: Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.