IR4016-20 : Single range testing voltage of 500 V
IR4017-20 : Single range testing voltage of 500 V
IR4018-20 : Single range testing voltage of 1000 V

• 3-range testing voltage of 250/500 V (insulation resistance testing up to 100 MΩ), and 1000 V (insulation testing up to 4000 MΩ)
• Continuity check at 3 Ω range via 200 mA testing
• Bright LED luminous scale
• Check for live circuits and battery status

• 5-range testing voltage of 50 V/100 MΩ to 1000 V/4000 MΩ
• Stable & medium-speed digital readings, 0.8 second response time of PASS/ FAIL decisions
• Drop proof onto concrete from 1m (3.28 feet)