The Extech 480400 Phase Sequence Tester is a dependable, battery-free tool designed for essential three-phase power verification and troubleshooting. Engineered for electrical professionals, this instrument simplifies the complex task of checking the phase orientation and status of three-phase power sources.

• Operation: No battery required for operation.
• Voltage Range: Rated test range from 40 VAC to 690 VAC.
• Frequency Range: Supports testing over a 15 Hz to 400 Hz frequency range.
• Display: Graphical multiline LCD clearly indicates phase orientation (clockwise or counter-clockwise) and phase status.
• Durability: Features a durable, double-molded housing for rugged field use.