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Portable Single-Phase Watthour Meter Tester
SKU: WT3-1-1-2 Category:



Portable Single Phase Watthour Meter Tester

The MT-1/NT5 is a uniquely versatile single-phase watthour meter tester. Loaded with features at only 5.7 lb, it is among the smallest single-phase meter testers available today.


The MT‐1/NT5 can test two phases simultaneously or separately, for commercial dual phase meters (5S, 12S, 35S and 45S). The meter under test is entirely controlled by the test socket. No wiring setup needed.

Perfect for Single-Phase

A complete tester for all your single-phase watthour testing needs, the MT-1/NT5 also has bi-directional testing capability for net-metering installations.


Uncompromised accuracy

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

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

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.

Technical Specifications

Compatible Meters
Single-Phase 1S, 2S, 3S*, 4S, 5S (35S), 12S, 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
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)
Physical Dimensions
Test Socket(Diam. x L) 6.9” x 7.7”
Remote Control(Diam. x L) 8.3” x 3.9” x 1″
Carrying Case(Diam. x L) 11” x 11” x 8″
Test Socket 5.7 lb
Remote Control(Diam. x L) 0.6 lb
Overall with Carrying Case(Diam. x L) 8.2 lb
Parts and Labor 2-years limited***
Carrying bag Update cable
User’s manual WTDataOne Software
Quick Start Guide 2 Removable Twist Tabs
Calibration report Remote Control

*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.

Often used with these accessories