

Extech CT20 Remote and Local Continuity Tester
The Extech CT20 is a versatile continuity tester designed for both local and remote applications. Ideal for electricians, cable installers, and technicians, it allows a single user to quickly identify and label wires, even when the wire ends are located in different rooms. With a range of up to 10,000 feet (3,000 meters) and a minimum wire gauge of 26, it accommodates various testing scenarios efficiently.
Description
The Extech CT20 Remote & Local Continuity Tester is an essential tool for professionals who need to verify the integrity and identification of electrical circuits and cables. Its dual functionality—local and remote continuity testing—makes it adaptable to a wide range of tasks.
Local Continuity Testing:
In local mode, the tester is connected directly to the circuit or cable under test. A bright flashing LED and a loud pulsating beeper provide immediate indication of continuity. This mode is ideal for testing in-wall wiring, light bulbs, fuses, switches, relay contacts, diodes, low-ohm power resistors, and circuit breakers. The tester’s compact design allows it to clip onto and hang from the cable under test without falling off, facilitating hands-free operation.
Remote Continuity Testing:
For remote testing, the CT20 utilizes a two-lead, bi-color (red/green) LED probe. This remote probe enables a single user to identify up to three wires or cables simultaneously, even when the wire ends are located in different rooms. The tester can accommodate test wire lengths up to 10,000 feet (3,000 meters) with a minimum wire gauge of 26. This feature is particularly useful for identifying and labeling wires in complex installations, such as cable TV, audio systems, alarm systems, and HVAC installations.
The CT20 operates on a 9V battery, providing approximately 12 months of battery life with normal use. Its continuity confirmation is effective for resistance levels equal to or less than 2.0 K Ohms, and it drives a pulsed current through the wire to facilitate accurate testing. The tester’s lightweight and pocket-sized design enhance portability and ease of use in various environments.
In summary, the Extech CT20 Remote & Local Continuity Tester is a reliable and efficient tool that streamlines the process of verifying and identifying electrical circuits and cables. Its dual testing modes, extended range, and user-friendly design make it an invaluable asset for professionals in the electrical and installation fields.
Features
- Dual Testing Modes: Supports both local and remote continuity testing.
- Extended Range: Accommodates test wire lengths up to 10,000 feet (3,000 meters).
- High Compatibility: Works with wires as small as 26 gauge.
- Remote Probe: Two-lead, bi-color LED probe identifies up to three wires simultaneously.
- Visual and Audible Indicators: Bright flashing LED and loud pulsating beeper signal continuity.
- Hands-Free Operation: Lightweight design clips onto and hangs from cables under test.
- Long Battery Life: Operates on a 9V battery with approximately 12 months of use.
- Wide Application: Ideal for electricians, cable installers, alarm technicians, and HVAC professionals.
- Compact Design: Pocket-sized for easy portability and storage.
- Durable Construction: Built to withstand the rigors of professional use.
Includes
- Extech CT20 Remote and Local Continuity Tester
- Test Leads with Alligator Clips
- 9V Battery
- Pouch



