Instruments for Class 3 Electrical Contractor License To apply for Class 3 Electrical Contractor License, you need to own below following equipments :- 1. Insulation Testing Meter 500V 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