Instruments for Class 1 Electrical Contractor License To apply for Class 1 Electrical Contractor License, you need to own below instruments :- 1. Insulation Testing Meter 500V & 1000V 2. Portable Voltmeter – range 0 to 600 Volts 3. Portable Ammeter – range 0 to 60 A 4. Multi meter 5. Tong Tester 6. Rubber Hand Gloves 7. Wire Gauge 8. Micro Meter 9. Earth Tester with Testing accessories 10. Phase Sequence Meter 11. Safety Belt