UNI-T UT505B | Handheld Insulation Resistance Tester

The UNI-T UT505B Handheld Insulation Resistance Tester is a higher-accuracy model within the UT505 series, suitable for electrical contractors, maintenance engineers, industrial technicians, and quality inspection teams. It combines insulation resistance testing, true RMS measurement capability, PI/DAR functions, data storage, a backlight, and a high-voltage warning in a single portable instrument. UNI-T lists UT505A and UT505B under the same handheld true RMS insulation resistance tester series.

Pro Tip

Use the comparison function during repeated equipment checks; it helps identify failed insulation conditions quickly against your preset acceptance limit.

Buyer’s Selection Guide

Choose the UT505B if you need the UT505 series platform with greater insulation-measurement accuracy across selected ranges. It is suitable for users who regularly test cables, panels, motors, and electrical equipment and require reliable diagnostic readings.

Key Features

• Handheld true RMS insulation resistance tester
  
• 50V / 100V / 250V / 500V / 1000V output options
  
• Insulation testing up to 100GΩ
  
• PI and DAR insulation diagnosis
  
• 99-group memory storage
  
• Data hold and LCD backlight
  
• Auto power off
  
• High-voltage output alarm
  
• IEC 61557 compliance support
  

Technical Specifications

• Model: UT505B
  
• Product Type: Handheld Insulation Resistance Tester
  
• Test Voltages: 50V / 100V / 250V / 500V / 1000V
  
• Insulation Resistance Range: up to 100GΩ
  
• Typical Accuracy: range-dependent, including ±(1.5%+5), ±(3%+3), ±(5%+3), ±(10%+3) depending on the selected range
  
• PI / DAR: Yes
  
• Data Storage: 99 groups
  
• High Voltage Alarm: Yes
  
• Display: Backlit LCD
  
• Certification: CE, UKCA, ETL
  

Applications

• Industrial insulation testing
  
• Motor winding insulation checks
  
• Cable fault diagnosis
  
• Switchgear and control panel testing
  
• Maintenance reporting and inspection