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Tool Type
Voltage Detector
Wire Continuity Tester
Wire Installation Tools
LCD Display
Ease of Installation
Intermediate (Installs < 60 minutes)
Extech Instruments
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Quickly Checks for AC Outlet Load Handling Capabilities and Outlet Tester functions
Extech Instruments CT70 AC Circuit Load Tester
Extech Instruments CT70 AC Circuit Load Tester
Extech Instruments CT70 AC Circuit Load Tester
Item# 90284
Price: Normally $199.99 
Hot Deal $169.87
Free shipping on orders over $50 - See Details


  • True RMS measurements
  • Finds false grounds, Tests GFCI and EPD circuits
  • Voltage measurements: Line, ground-to-neutral, and peak
  • Measures frequency of the voltage
  • Checks 3-wire receptacle configuration

Essential Info

The Extech CT70 AC Circuit Load Tester can detect circuit and wiring problems such as: Poor ground impedance, false grounds, missing ground fault protection, low voltage availability under load, and high ground-to-neutral voltage. In addition, the CT70 tests GFCI and EPD circuits.

Circuit and wiring issues listed above can introduce shock hazards (from grounding issues) and can comprise performance of machinery and equipment (from poor ground impedance, lack of sufficient voltage under load and/or high ground-to-neutral voltage). In addition, fire can result from the heat generated by high resistance points in a circuit.

Proper wiring habits have been shown to greatly increase power quality performance. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.

The CT70 AC Circuit Load Tester can test outlets or circuits under load for proper wiring, reverse polarity, and the presence of a ground. The CT70 uses a simple menu-driven display to allow the user to quickly see line voltage, voltage drop under full load, ground-toneutral voltage, and line impedance. The GFCI testing utility is performed separately per UL-1436, disrupting the flow of electricity if a functioning GFCI is present.


What's Included

1x - AC Circuit Tester
1x - 3 Prong AC Test Cord

More Info

  AC Load Tester:
  • Selectable loads of 12, 15 and 20 Amps
  • Measures loaded and unloaded AC Line Voltage
  • Calculates and displays % Voltage Drop and Line Impedance
  • Displays Peak Line Voltage and Frequency

    Outlet Tester functions:
  • Neutral to Ground Voltage
  • Hot, Neutral and Ground Impedance
  • GFCI Trip Time
  • GFCI Trip Current
  • Open or Reversed wiring

  • Specifications

    ManufacturerExtech Instruments
    Manufacturer Product No.CT70
    UPC 793950000700
    AC Voltage90V to 240V
    Frequency45hz to 65hz
    Peak Line Voltage350VDC
    % Voltage Drop0.1 to 99.9%
    Dimensions8" x 2.8" x 2" (203 x 71 x 50 mm)
    Weight11.2oz (317.5g)

    Important notes:
    Only defective exchanges for identical item within 30 days of purchase. No other returns allowed on this item. For defective returns after 30 days, please contact the manufacturer.
    Manufacturer contact information: Extech Instruments Corp, Tel: (781) 890-7440 Ext 200


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