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Description
MT-1/WT3
Portable 3-phase wireless watthour meter tester
for instant results
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

Easily acquire accurate measurements wirelessly




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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.

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%.


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

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

Calibration
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.
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% |
environment | |
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” |
Weight | |
Test Socket | 6.4 lb |
Warranty | |
Parts and Labor | 2-years limited*** |
advanced features | |
Wh/VARh | |
Reverse Flow Test for bidirectional meters | |
Line Monitor | |
KW Demand Test | |
Creep Test | |
INCLUDED | |
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.