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EXTECH CT40 Cable Identifier/Tester Kit


Cable Identifier – 16 Cables

The Extech CT40 enables one person to troubleshoot electrical/electronic circuits and remotely identify up to 16 wires. Multimeter functions of the Extech CT40 include AC/DC voltage and current, resistance, diode and continuity.

With the Extech CT40 cable identifier/tester kit, you can check wire voltages from 5 to 16 VDC. Other features of the Extech CT40 cable identifier/tester kit includes data hold, max hold and auto power off. Both the Extech CT40 transmitter and receiver feature a low battery indicator. These Extech units also feature a CAT III-600V safety rating.

Authorised Australian Distributor

CE   CAT III   1 Year

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SKU: EXTECH CT40 Category: Tags: , , ,

The Extech CT40 is a cable tester which uses a transmitter/receiver to allow for wire identification of an individual core to the end of a multi-core cable .The meter’s digital multimeter functions provides for easy measurement of AC/DC Voltage, AC/DC Current, Resistance, Continuity and Diode check. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit the Extech Instruments website ( to check for the latest version of this User Guide.

Extech CT40 Features:

  • Transmitter/Receiver enables one person to remotely identify up to 16 wires
  • Wire voltage check from 5 to 16VDC
  • Multimeter functions include: AC/DC Voltage and Current, Resistance, Diode, and Continuity
  • Data Hold and Max Hold
  • Low battery indicator (transmitter and receiver)
  • Auto power off
  • CAT III-600V safety rating
  • Complete with 16-line Transmitter, Multimeter/Receiver, two 9V batteries, pouch case, and 2 AAA batteries

Extech CT40 Specifications

Display Counts 2,000 count
Basic Accuracy 1.0%
DC/AC Voltage 0.1mV to 600VDC
1mV to 600VAC
DC/AC Current 0.1μA to 200mA
Resistance 0.1Ωto 20MΩ
Diode/Continuity Yes
Dimensions 6.3×2.9×1.7″(162×74.5x44mm)
Weight 10.8oz (308g)
Display Two red LED lamps
Test Leads 17 alligator clips (16 red and 1 black (ground))
Cable resistance 30kΩ max
Display Two digit blue LED display
Test Leads 2 alligator clips (1 red and 1 black)
Weight .5 kg


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