Spec:

Item Type: Insulation Resistance Tester
Model: VC60B+
Insulation Resistance Measurement Range:
250V: 0.4MΩ - 999MΩ
500V: 0.6MΩ - 1999MΩ
1000V: 0.8MΩ - 4999MΩ
Voltage Measurement: DC±(20-1000)V; AC 20V-750V
Display: Digital: Maximum (60B+: 5000) character display, white backlight
Operating Temperature And Humidity: 0-40℃, relative humidity ≤85%(no condensation)
Storage Temperature And Humidity: -20-60℃, relative humidity ≤90%(no condensation)
Accuracy Guarantee Temperature And Humidity: 23±5℃, relative humidity ≤75%(no condensation)
Operating Environment Conditions: Indoor, outdoor use(not ), altitude 0-2000 meters
Overrange Indication: Voltage: 0L; 60B+ Insulation Resistance: >0.999G, >1.999G, >4.999G
Battery Type: 8 x 1.5V(LR6) AA battery(not included)
Low Battery Display: Low battery indicator
Auto Power Off: Default to about 15 minutes of no operation

Package List:
1 x Main Unit
1 x Carrying Strap
2 x Test Probes
2 x Crocodile Clips
1 x User Manual

How To Use:
sure the wire and instrument are securely connected during use.