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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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Hioki Insulation Testers

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The Hioki IR4056-20 and IR4057-20 insulation testers deliver enhanced comparator (comparative judgment) functionality and notification of judgment results using light and sound, allowing operators to assess results at a glance. The instruments yield significant improvements in work efficiency and are essential when judging the safety of electrical equipment, for example, during regular inspections and testing of indoor wiring in junction boxes.

The IR4057-20 can display measurement results in bar graph form to facilitate a more visual judgment process. Additionally, the higher performance IR4057-20’s comparator function yields faster judgments than the IR4056-20 (approximately 0.3 seconds for the IR4057-20 compared to approximately 0.8 seconds for the IR4056-20).

IR4056-20 & IR4057-20

  • Five ranges testing voltage 50 to 1000 V
  • Stable digital readings
  • Comparator function
  • 600V AC/DC meter
  • 200 mA continuity check
  • Drop Proof
  • Hard case in a body

IR4057-20 only

  • High-speed digital readings
  • Digital & Bargraph display


  • Maintenance inspections of electrical equipment
  • Maintenance inspections of building and manufacturing plant equipment
  • Maintenance inspections of communications equipment and instrumentation
  • Voltage measurement in solar power systems and electric vehicles




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Item #

Item Name

IR4056-20 Hioki Digital Insulation Tester
IR4057-20 Hioki Digital & Bargraph Insulation Tester
HK/L9787-91 Hioki Breaker pin for IR4056
HK/L9788-11 Hioki Test Lead set with remote switch for IR4056
  Results 1 - 4 of 4 1