# CT20 Extech Insulation New

**Features:**

-   A bright flashing LED and loud pulsating beeper indicate local continuity
-   Remote continuity with the use of the remote probe
-   Flashing remote probe - two lead, bi-color (red/green) LED probe allows a single user to identify up to three wires or cables at a time
-   Lightweight and pocketsized, clips on and hangs from the cable(s) under test without falling off
-   Great for Electricians and Helpers, Cable TV and Audio System Installers, Alarm Technicians, Plumbers, HVAC Installers etc.

**Specifications:**

-   Power supply: 9 Volt Battery
-   Beeper: 85dB beeper
-   Battery life: Approx. 12 months with normal use.
-   Continuity confirmation: Equal to or less than 2.0 K Ohms
-   Continuity drive current: Pulsed (2.0 Hz) 20 - 50mA at 10 Ohms and 2.0mA - 8.0mA at 1000 Ohms.
-   Wire Verification Distance: 10,000 ft., 3,000 m (26 Gage min.)
-   Fuse: 250V 0.5A fast blow
-   Operating Temperature: -12 to 45°C (10°F to 113°F)
-   Storage Temperature: -20 to 80°C (-4 to 176°F)
-   Operating Humidity: 10 to 90% RH (non-condensing)
-   Dimensions: 90 x 57 x 29mm (3.6 x 2.2 x 1.14")

The CT20 is an electronic tool for electricians, alarm, cable installers and others who routinely need to check circuits for continuity and also identify cables and wires. It allows a single user to quickly identify and label two wires even when the wire ends are located in different rooms. It can accommodate test wire lengths up to 10,000-feet (3,000 meters), 26-gauge minimum. The CT20’s Remote Continuity mode allows the user to check continuity and to identify two or more cables/wires simultaneously.

## Details

- **Price:** 47.99 USD
- **Vendor:** Extech
- **Type:** Ins Test
- **Tags:** Extech, Insulation Tester, Manufacturers, Other Equipment, product_manual_group_2, Product_new

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 47.99 USD | In stock |

## Images

- CT20 Extech Insulation

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> Source: [ValueTronics](https://valuetronics.com/products/ct20-extech-insulation-new)
> Updated: 2026-05-21