MUL-351 Digital Insulation Tester Resistance Meter 250V / 500V / 1000V Output Voltage 750V AC Voltage Megohmmeter Large LCD Display with Blacklight and Buzzer Alarm

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This portable Insulation Resistance Tester is designed to help prevent hazards such as electric shock and short-circuits.

Insulation in electrical devices, parts, and equipment used in industrial plants degrade over long period of use, this instrument will help the maintenance and safety in the home, schools, buildings, factories etc.

Application: suitable for measuring electrical machinery, cable, electromechanical equipment, telecom equipment, electric power facilities and other insulation resistance.


  • Insulation Resistance Measurement
  • Alternating Current (AC) Measurement
  • Direct Current (DC) Measurement
  • Small Resistance Measurement
  • Can also measure electric supply
  • Wide measuring range
  • Backlight display
  • Data HOLD function
  • Low battery indicator
  • Large screen digital display
  • Over-limit Alarm
  • Red light and buzzer alarm
  • High voltage alarm


  • Display: 3.5 digit LCD, maximum reading "1999"
  • Over-limit Indication: When over measuring range, will only display "1"
  • Sampling Rate: About 3 times/second
  • Allowable Altitude: <2000 meters
  • Additional temperature coefficient: 0.15 × specified accuracy/℃ (<18 ℃ or >28℃)
  • Operating Environment: -15℃~55℃, relative humidity <75%RH
  • Storage Environment: -40℃~60℃ ,relative humidity <90%RH
  • Overload Protection:100mA/60V resettable fuse
  • Power Supply: 6* 1.5V“AA” batteries
  • Current Consumption: No-load power consumption <300mW when testing
  • Size: 176*110*77mm
  • Weight: approx. 580g

    Technical Specifications:

    Function Measuring Range  Accuracy
    Output Voltage 250V/500V/1000V ±10%
    Test Current 250V(R=250kΩ)1mA 500V(R=500kΩ)1mA 1000V(R=1MΩ)1mA ±10%
    Insulation Resistance 250V:1MΩ~200MΩ 500V:1MΩ~200MΩ 1000V:10MΩ~2000MΩ ±(4%±2)
    Short-circuit Current <1.8mA
    Median Resistance 250V/500V:100MΩ 1000V:1000MΩ
    Resistance, Continuity Test 0Ω~2KΩ,<50Ω buzzer will make a sound,Test Current:1mA ±(0.8%±6)
    DC Voltage Measurement 0V~1000V ±(0.5%±6)
    AC Voltage Measurement 0V~750V ±(1%±6)
    Jack Position Insulation Resistance E and L Voltage, Resistance V/Ω and G

Set Includes:

  • 1 x Insulation Resistance Tester
  • 6 x 1.5V AA battery
  • 1 x 10A Test Pen
  • 1 x Alligator Clip
  • 1 x Strap
  • 1 x Carrying Pouch
  • English Instruction Manual
  • Standard factory Packaging

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