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Extech
Extech CT20 Continuity Tester
Quote on request
No online payment · add lines to RFQ BOM
Continuity ≤2 kΩ; remote bi-color probe; to 10,000 ft. RFQ + selection help.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Continuity Threshold
≤2.0 kΩ
Drive Current
Pulsed 2.0 Hz; 20–50 mA @ 10 Ω; 2.0–8.0 mA @ 1000 Ω
Local Indication
Bright flashing red LED + 85 dB pulsating beeper
Remote Probe
Two-lead bi-color (red/green) LED probe; identifies up to 3 wires/cables per trip
Test Wire Length
Up to 10,000 ft (3,000 m); 26 AWG minimum
Polarity Verification
20 mA DC current pulse drives remote probe for polarity/wire ID
Fits long-run continuity and wire ID checks where you need an Extech CT20 with ≤2.0 kΩ threshold, remote bi-color LED probe, and test lengths up to 10,000 ft (3,000 m).
Key advantages
- Threshold — Continuity ≤2.0 kΩ
- Indication — Bright flashing red LED + 85 dB pulsating beeper
- Remote — Bi-color (red/green) LED probe; identify up to 3 wires per trip
- Length — Up to 10,000 ft (3,000 m); 26 AWG minimum
- Drive — Pulsed 2.0 Hz; polarity verification via 20 mA DC pulse
Typical applications
- Cable continuity over long runs.
- Wire identification with remote probe.
- Polarity checks on installed conductors.
Selection guide
- Length / AWG — Up to 10k ft; ≥26 AWG
- Remote probe — Wire ID workflow
- Power — 9 V; ~12 months normal use
- Environment — 32–122 °F; 10–90% RH
Common mistakes
- Expecting low-ohm Kelvin milliohm accuracy.
- Using below 26 AWG on max length.
- Ignoring polarity LED meaning on remote.
When to RFQ / what to tell us
- Accessories; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 24476 |
| Brand | Extech |
| Model | CT20 Continuity Tester |
| Product type | Continuity Tester |
| Continuity threshold | ≤2.0 kΩ |
| Drive current | Pulsed 2.0 Hz; 20–50 mA @ 10 Ω; 2.0–8.0 mA @ 1000 Ω |
| Local indication | Bright flashing red LED + 85 dB pulsating beeper |
| Remote probe | Two-lead bi-color (red/green) LED probe; identifies up to 3 wires/cables per trip |
| Test wire length | Up to 10,000 ft (3,000 m); 26 AWG minimum |
| Polarity verification | 20 mA DC current pulse drives remote probe for polarity/wire ID |
| Power | 1 × 9 V battery |
| Battery life | Approx. 12 months normal use |
| Operating temperature | 32 to 122°F (0 to 50°C) |
| Dimensions | 3.6 × 2.2 × 1.14 in (90 × 57 × 29 mm) |
| Weight | 9.2 oz (260 g) |
| Certifications | CE |
Documents
FAQ
Q: Max wire length? A: Up to 10,000 ft (3,000 m).
Q: Remote probe? A: Yes — bi-color LED probe for polarity/wire ID.
Q: What should I send for a quote? A: Accessories, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Continuity Threshold | ≤2.0 kΩ |
| Drive Current | Pulsed 2.0 Hz; 20–50 mA @ 10 Ω; 2.0–8.0 mA @ 1000 Ω |
| Local Indication | Bright flashing red LED + 85 dB pulsating beeper |
| Remote Probe | Two-lead bi-color (red/green) LED probe; identifies up to 3 wires/cables per trip |
| Test Wire Length | Up to 10,000 ft (3,000 m); 26 AWG minimum |
| Polarity Verification | 20 mA DC current pulse drives remote probe for polarity/wire ID |
| Power Supply | 1 × 9 V battery |
| Battery Life | Approx. 12 months normal use |
| Operating Temperature | 32 to 122°F (0 to 50°C) |
| Operating Humidity | 10 to 90% RH non-condensing |
| Dimensions | 3.6 × 2.2 × 1.14 in (90 × 57 × 29 mm) |
| Weight | 9.2 oz (260 g) |
| Certifications | CE |
| Warranty | 2 years (FLIR/Extech) |