Description
Product Overview
The Extech TG20 wire tracer is a lightweight, battery‑powered instrument built for precise wire identification and continuity testing. Housed in a durable black case, it operates on two 9V nickel oxyhydroxide batteries (included) and features an adjustable sensitivity control to eliminate false detections. With a maximum temperature rating of 1022°F, the device is robust enough for demanding industrial environments.
Usage
Ideal for electricians, telecom technicians, and maintenance professionals, the TG20 excels in tracing cable runs, verifying telephone line polarity, and locating open circuits in residential or commercial settings. Its RJ11 connector and alligator clips enable quick connection to phone lines or exposed conductors, making it suitable for both new installations and troubleshooting existing systems.

Why Choose Us
Extech’s reputation for reliable measurement tools ensures the TG20 delivers consistent performance. The device’s ergonomic design, long‑lasting batteries, and comprehensive accessory kit provide excellent value. Backed by a solid warranty and positive customer reviews, it stands out among circuit tracers for accuracy and ease of use.
Key Features
- Identifies wire pairs and checks continuity with adjustable sensitivity
- Tests telephone line polarity using RJ11 connector
- Battery‑powered operation with two 9V batteries included
- Compact size (8.7 x 2 x 1.3 inches) and lightweight (3.52 oz)
- Complete kit: transmitter, probe, alligator clips, and RJ11 cable
FAQ
What batteries does the TG20 use?
The TG20 requires two 9V nickel oxyhydroxide batteries, which are included in the package for immediate use.
Can the TG20 detect high voltage circuits?
The TG20 is designed for low‑voltage wire tracing and continuity testing; it is not intended for high‑voltage measurements.
Is the device suitable for outdoor use?
Yes, its rugged construction and battery operation make it suitable for field work, though it should be kept dry and protected from extreme weather.
How does the sensitivity control improve performance?
Adjustable sensitivity filters out background noise, allowing precise identification of the target wire without false alarms.
What is the warranty period?
Extech provides a one‑year limited warranty covering manufacturing defects.








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