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The Original is Still the Best

The Original Analog Phasing Tester Set

Back in 1943, Marvin Wilson Bevins handmade the first original Phasing Voltmeter Tester while he was an Area Engineer with PSO. His goal: ensure crews could safely test for phase relationships on the utility lines.

His invention included a panel meter and wood with dielectric properties along with a bridge rectifier on a circuit board dropping the voltage to a safe level in order to be read on a 1 1/2 milliamp meter.

The electrical principles behind his invention are still state of the art technology to this day.


  • Simple to operate
  • Safely insulates using Epoxiglas┬« universal handles
  • Easily determines phase relationships
  • Quickly reads phase-to-phase or phase-to-ground voltage

On matched phases, the tester will read near zero, otherwise the tester will read the voltage difference between the two conductors. For use on both Overhead and Underground circuits with appropriate adapters.


Safety is always the first priority when using these products. In addition to the provided operating instructions, follow all applicable Government and Utility standard work practices and procedures.

Some linemen still prefer the needle movement of the original Analog Phasing Voltmeter Tester.

Still the Best Phasing Set Ever!