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Portable 3-Phase Watthour Meter Tester
SKU: WT3-1-1 Category:



Portable 3-phase watthour meter tester

The MT-1/NT9 is an all-in-one portable meter tester with advanced features such as VARh testing, kW demand test, THD consumer line monitoring and bi-directional testing for Net Metering installations. No other equipment needed.

A fast and accurate test is done within a few minutes! No setup wiring necessary. The MT1/NT9 is a full-featured tester at a budget-friendly price!

Easy setup

Fast setup with no wiring and a dead-front design means your operation is quicker and safer.

Setting-up your test has never been easier.


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%.


Highly Compatible

You can test commercial and industrial three-phase meters along with residential meters.

Easily configurable with twist & lock removable tabs, you will be able to test both solid state and electromechanical meters.

Technical Specs

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**
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 WTDataOne Software
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.