Circuit Mapper System

Rated 4.67 out of 5 based on 6 customer ratings
(6 customer reviews)




  • First-of-its-kind device that maps branch circuits of wiring systems concurrently with a single transmitter and receiver.
  • Eliminates the need to trace individual circuits one at a time, greatly improving branch circuit tracing efficiency.
  • Provides a full digital LED readout – no more manual adjustments.
  • Features a non-contact setting which allows signals to be read through wiring insulation, without direct electrical contact.
  • Designed for use on both energized and dead systems.
  • * Comes with 24, 42 or 84 yellow CT clips (3 shown).

2 Year Limited Warranty Check out our new demo video!

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The revolutionary Circuit Mapper System from TASCO maps all branch circuits quickly and easily. Poorly labeled breaker panels are an unfortunate fact of life, but they don’t have to hold you up. The Circuit Mapper System enables you to work quickly and accurately. This branch circuit identifier completely maps all circuits and breaker connections from a single breaker panel. Its digital output shows the complete circuit you are testing. You can map a full breaker panel all at once with this branch circuit tracer.

Forget about the LEDs and confusing displays that come with a conventional electrical circuit tracer. The Circuit Mapper System comes in three models. The CMT24DS maps a 24-circuit panel, suitable for residential or smaller buildings. The CMT42DS maps a complete 42-circuit breaker panel common in most new residential or light office space. The CMT84DS maps 2-42 circuit panels in the same panel room or can even map 2-42 circuit panels on different floors at the same time. The Circuit Mapper System has several clear benefits over a conventional electrical branch circuit identifier. It can save immense amounts of time and will quickly pay for itself. The unit eliminates the mistakes that can occur with a competing electrical wiring locator.

Each of the clamps connected from the transmitter around a conductive circuit induce a coded signal modulated at 166KHz and 250KHz.  There is a unique code for each of the branch circuits.  The receiver is able to measure the signal on a conductor when the probe is inserted to the outlet.  Because of the unique frequency and code of the transmitted signal, the receiver is able to determine the strongest signal at any given outlet or lightswitch and display that reading to the user.

In a nutshell, the TASCO Circuit Mapper System will enable you to do better, more accurate and more efficient work. In addition, you can count on TASCO to provide unrivaled support for this electrical wiring tracer. Help is just a phone call away, and one call is all it usually takes to solve a problem. In the unlikely event that the Circuit Mapper System isn’t the right tool for you, TASCO will take it back with no hassles. TASCO has provided dependable tools to the trade since 1986.



POWER: Standard 9 VDC Alkaline battery (Included)

CURRENT DRAW: 35 mA avg.



OPERATING TEMPATURE: 0º F – 120º F (-18ºC -50ºC)

SIZE: 6.5” x 2.7” x 0.9” (105mm x 69mm x 23mm)


POWER: Standard 9 Volt Battery (Included)

CURRENT DRAW: 90 mA avg.


OPERATING TEMPATURE: 0º F – 120º F (-18ºC -50ºC)

SIZE: 9.0” x 3.0” x 1.2” (229mm x 76mm x 30mm)

Additional information

Weight 6 lbs
Dimensions 12 x 10 x 7 in
Circuit Model

24, 42, 84

6 reviews for Circuit Mapper System

  1. Rated 5 out of 5

    Stop Messing around and get the Tasco CMT42S or the CMT24S!

  2. Rated 5 out of 5

    This is the best investment I have ever made. I can map an entire house in less than 30 min. Customers love it too.

  3. Rated 5 out of 5

    Your product really does work good! It has impressed the hell out of all of us.

  4. Rated 4 out of 5

    Guys sure love it. So does our customers. I has been put to good use.

  5. Rated 4 out of 5

    We really like your testers. It works really really well.

  6. Rated 5 out of 5

    for gods sake, just buy it. you can thank us later.

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