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Weschler Instruments is a manufacturer and distributor of electrical and electronic measurement equipment. Customers worldwide use our products in power plants, steel mills, chemical plants, paper mills and other industrial applications that require rugged, reliable and accurate instrumentation.
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Megger Phase Testers

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Megger Cable Phasing Meter

The Model 830220-1 Cable Phasing Meter offers a safe and quick method of measuring voltage and determining phase rotation of underground distribution systems using the capacitance test point of elbow connectors.

Max. V 30,000  Frequency 50/60 Hz

  • Safe low voltage operation
  • 15 kV and 30 kV ranges
  • Measures capacitance of test point if system voltage is known
  • Checks phase rotation
  • Phases out cables
  • Battery operated
  • Leather carrying case included


Megger Phase Sequence Tester

The Megger PSI-700A is a rugged, lightweight instrument used to determine the phase sequence or phase rotation of a three-phase system. It will also detect and identify an open phase. 

The PSI-700A is simple to use. The operator connects thre leads to the system and a lamp will instantly indicate either ABC clockwise rotation or CBA counter-clockwise rotation. Three lamps will light to indicate that all phase voltages are present. If a phase is open, only one lamp will light and identify the open phase.

Max V. 700  Frequency 50/60 Hz

  • Indicates clockwise or counterclockwise rotation
  • Detects open A, B or C phase
  • No moving parts, batteries or binding ...


Megger Motor & Phase Rotation Tester


The Motor and Phase Rotation Tester permits the electrical contractor or industrial maintenance electrician to permanently connect and tape the terminals of the motor being installed, without having to first energize the motor by a temporary hookup from a power source, if available, to determine motor rotation. Therefore, the test set eliminates the need for temporary connections that can be time consuming, costly and quite hazardous, particularly where many large, high-voltage motors are involved. 

Also, certain types of drives should never be rotated in the wrong direction. In such cases, the temporary hookup or trial method, having a fifty-fifty chance of being wrong, can do serious harm. 

The three motor ...