Extech - Non-Contact Phase Sequence Tester

The Extech Phase Sequence Tester is an essential tool for electricians and maintenance professionals working with three-phase AC systems. This handheld device quickly identifies phase sequence orientation and detects live phases with visual and audible feedback.

Designed for input voltages from 75 to 1000VAC at 45–65Hz frequencies, it delivers reliable performance across standard industrial and commercial applications. Bright LEDs indicate whether phases rotate clockwise or counter-clockwise and confirm which phases are energized. The beeper provides intuitive feedback—sounding intermittently when correct phase sequence is detected and continuously when phase reversal is present.

Built for durability and convenience, the tester features a rugged housing with a back cover magnet that securely attaches to AC distribution panels for hands-free operation. Fully insulated alligator clips with wide jaws ensure safe, stable connections. An adjustable Hi/Lo LED brightness switch adapts to any lighting condition, from dimly lit electrical rooms to bright outdoor installations. Low battery warning keeps you informed so you're never caught without power.

Compact, reliable, and field-proven—this phase sequence tester is the smart choice for accurate three-phase diagnostics.