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Portable single-phase wireless watthour meter tester

The MT-1/WT1 is the most complete portable single-phase meter tester featuring WiFi technology. With two-built-in 50A current synthetizers (phantom load), watthour standard and dead-front design, this tester offers a hassle free setup and a safe operation.
It can easily be controlled from any mobile devices and personal computer. The MT-1/WT-1 tests all common residential meter forms 1S, 2S, 3S, 4S and 12S, with the added benefits of testing 5S, 35S and 45S forms. It is compatible with either solid state and electromechanical meters.
It also allows VARh testing, kW demand test, line monitoring with THD analysis and bidirectional testing for Net Metering installations in a lightweight and portable format. Test results in CSV or other formats can be downloaded into a computer using the WTDataOne software included in the kit.
The MT-1/WT1 comes with a complete calibration report certifying accuracy for both Wh and VARh scales over the entire operating range using a reference standard traceable to NIST offering a typical accuracy of ±0.02%.


Three Built-in 50A Current Synthesizers (Phantom Load)

  • Simulates active and reactive loads.
  • Regulated test currents up to 50A.

Built-in Watthour Standard

  • High accuracy 2-phase watthour standard.
  • Stable accuracy within the specified temperature operating range.
  • Comes with a complete calibration report certifying measurement accuracy over its entire 36-point operating range using a reference standard traceable to NIST.

Easy to Use

  • No wiring needed.
  • Twist and lock removable tab can be placed without tools at 3, 6, 9 or 12 o’clock.
  • Notch to facilitate the insertion of meters with KYZ cables.
  • Dead-front design for safer operation.


Compatible Meters
Single-Phase 1S, 2S, 3S*, 4S, 5S (35S), 12S, 45S
Class 10, 20, 100, 200, 320**
Compatible devices
Operating system 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
internal single-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 5.7 lb
Parts and Labor 2-years limited***
advanced features
Reverse Flow Test for bidirectional meters  
Line Monitor  
KW Demand Test  
Creep Test  

*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.