Phase sequence detection (positive phase, anti-phase, default phase), live line inspection, simple electrical inspection, fire line identification, default phase judgment, broken line location search, DC line breakpoint detection, line maintenance. 1. Model No.: ETCR1000D 2. Test Method: Non-contact type 3. Live Electricity Range: AC 70~1000V 4. Frequency Range: 45~65Hz 5. Clamp Wire Diameter: Φ10~Φ40mm 6. Power Supply: DC 3V AA alkaline batteries (LR6)×2PCS