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Portable 3-phase wireless watthour meter tester
SKU: WT3-1 Category:



Portable 3-phase wireless watthour meter tester

Safe and fast setup
for instant results
The latest generation of portable meter testers with built-in WiFi technology.

Our wireless socket-type device, with its dead-front design, attaches quickly and securely.

  • Powered by a built-in 3-phase phantom load of synthesized 50 A current source and an integrated highly precise watthour standard
  • 3-phase reference standard at 0.02% accuracy
  • NIST-traceable
  • Autodetects various meter forms

Like all our wireless products, the meter tester can be paired with a mobile device in seconds by scanning its QR code while using the Probewell Connect app.

SIZE: 6.9″ X 6.7″

WEIGHT: 6.4 lbs

Probewell | MT-1/WT1 | Wireless Accurate Assessement

Easily acquire accurate measurements wirelessly

Like all our wireless products, the meter tester can be paired with a mobile device in seconds by scanning its QR code, when using Probewell Connect.

Speed up your 3-phase testing

Wh & VARh testing, kW demand test, line monitoring with THD analysis and bidirectional testing
for Net Metering installations directly on your mobile device or laptop.

Probewell Connect 2.0 | Quick Test | Electric Meter Testing

No wires, no problems

Fast twist & lock tab setup with no wiring and a dead-front design means your operation is quicker and safer.
Setting-up your test has never been easier; you’ll be testing in no time.

Uncompromised accuracy

Three built-in 50A current synthesizers (phantom load) simulate active and reactive load.

Its built-in three-phase Wh/VARh standard will offer you a typical NIST traceable accuracy of ±0.02%.

Learn more about technical specifications >

Probewell Connect 2.0 | Traceable Report | Electric Meter Testing
Probewell Connect 2.0 | WT Series | Wireless Meter Tester

Wirelessly efficient

With built-in Wi-Fi, your tester connects wirelessly to either your laptop or device running on iOS & Android mobile.

By maximizing both your device’s camera and GPS, many manual operations are shortcut to save you valuable time.

Download the app >

Highly Compatible

You can test residential, commercial and industrial single & three-phase meters. Easily configurable with twist & lock removable tabs, you will be able to test both solid state and electromechanical meters.

Single-phase: 1S, 2S, 3S, 4S, 12S(N) and 25S

Three-phase: 6S, 8S, 9S, 12S, 14S, 15S, 16S, 36S, 46S, 96S and Fitzall™ (5S, 35S and 45S)

Class: 10, 20, 100, 200, 320**

Send results by Email, by PDF or by CSV file

You can quickly email test results directly from our App or batch-export all your testing data in CSV format to facilitate integration with your local systems.

Click for a sample csv file >
Click for a sample pdf report >

How to export a CSV or PDF test report
Probewell Connect 2.0 | iOS, Android and Windows Compatible | Meter Test

What if I test in remote areas?

No wireless network coverage is required. All tests results are stored in the unit.


Combined with its high portability and lightning quick operation, it is the ideal companion for testing in remote areas.

Probewell | Meter Testing | Probewell Connect | No WiFi, No Problem | remote-areas


You can calibrate the units yourself with our ATK Calibration Kit and export calibration reports in PDF format.

We can also do it for you which includes a calibration certificate traceable to NIST.

Learn more about our calibration kits >

How to perform an Accuracy Test

Technical Specifications

Compatible Meters
Single-Phase 1S, 2S, 3S*, 4S, 12S(N) and 25S
Three-Phase 6S, 8S, 9S, 12S, 14S, 15S, 16S, 36S, 46S, 96S and Fitzall™ (5S, 35S and 45S)
Class 10, 20, 100, 200, 320**
Compatible devices
Operating systems IOS®, Android®, Windows®
Test Socket
Input Voltage 100 – 600VAC
Line Frequency 58 – 62Hz
Power Consumption 75VA (maximum)
Circuit Breakers 2 x 1A (press-to-reset mechanism)
Current Synthesizers
Adjustable Current 0.25 to 50A
Phase Angle (Wh) Unity and 60° Lag
Phase Angle (VARh) 90° and 30° Lag
internal 3-phase Watthour Standard
Typical Accuracy ±0.02%
Guaranteed Accuracy ±0.05%
Operation Temperature -4° to 140°F (-20° to 60°C)
Storage Temperature -4° to 140°F (-20° to 60°C)
Humidity 5% to 95% (non condensing)
Physical Dimensions
Test Socket (Diam. x L) 6.9” x 7.7”
Test Socket 6.4 lb
Parts and Labor 2-years limited***
advanced features
Reverse Flow Test for bidirectional meters
Line Monitor
KW Demand Test
Creep Test
Carrying bag Update cable
User’s manual Probewell Connect App.
Quick Start Guide 2 Removable Twist Tabs
Calibration report

*An adapter is required to verify 3S Sensus Meter.
**An adapter may be required depending on the meter installation.
***Only applicable to units shipped to Canada or USA. 1-year warranty for other countries.

Ask about our trade-in program

Trade-in older tester models and save big on your purchase of new Probewell meter testers.