Key facts
- Brand
- EXTECH
- Model
- CT20
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-01
Start here

Extech CT20 Continuity Tester Pro User's Guide
The Extech CT20 Continuity Tester Pro is designed to allow a single user to quickly identify and label two wires even when their ends are located in different rooms. The device includes a main pulsing unit with a remote probe for verifying continuity over long distances or identifying individual cables within multi-wire installations.
Read onlineEXTECH CT20 specifications
| Power supply | 9 Volt Battery |
|---|---|
| Beeper volume | 85dB |
| Battery life | Approx. 12 months with normal use |
| Continuity confirmation limit | Equal to or less than 2.0 K Ohms |
| Wire Verification Distance | 10,000 Ft, 3,000 m (26 Gage min.) |
| Operating Temperature | 10 oF to 113oF (-12 to 45oC) |
| Dimensions | 3.6 x 2.2 x 1.14” (90 x 57 x 29mm) |
| Weight | 9.2oz (260g) |
All EXTECH CT20 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What is the maximum wire verification distance for the CT20?
The tester can verify continuity over a distance of up to 10,000 feet or 3,000 meters with a minimum of 26 Gage wire.
How long does the battery last under normal use?
The included 9 Volt Battery provides approximately 12 months of service with normal usage.
What is the primary use of the EXTECH CT20 Continuity Tester Pro?
It is designed for one-person operation to test wire and cable continuity, both locally and remotely.
How many wires or cables can be identified at once using the remote probe?
The bi-color LED probe allows a single user to identify up to three wires or cables at a time.
