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Portable single-phase watthour meter tester

Powered by the most advanced technology, 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 will test all common residential meter forms 1S, 2S, 3S, 4S and 12S, with the added benefits of testing 5S, 35S and 45S forms.
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.
HL, LL and PF test requirements are set automatically according to the TA of the meter being tested. Any non-standard current can also be user-programmed for special needs.
The MT-1/NT5 also has bi-directional testing capability for net-metering installations.
SKU: NT5 Category:


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

  • Simulates active 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

  • Twist and lock removable tab can be placed without tools at 3, 6, 9 and 12 o’clock.
  • Handheld remote control with its intuitive menus.
  • Deadfront design for safer operation.


Compatible Meters
Form 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 Unity and 60° Lag
Single-Phase Watthour Standard
Typical Accuracy ±0.02%
Guaranteed Accuracy ±0.05%
Operation -4° to 140°F (-20° to 60°C)
Storage -4° to 140°F (-20° to 60°C)
Humidity 5% to 95% (non condensing)
Physical Dimensions
Test Socket (Diam. x D) 6.9” x 7.7”
Remote Control (HxLxD) 8.3” x 3.9” x 1”
Carrying Bag (HxLxD) 11” x 11” x 8”
Test Socket 5.7 lb
Remote Control 0.6 lb
Overall with Carrying Bag 8.2 lb
Parts and Labor 2-years limited***

*An adaptor 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.