1. Immediate Phase Analysis This 3phase sequence tester detects open phases and rotation direction in seconds through LED indicators and buzzer alerts. Eliminates guesswork for electricians working on 60600V AC systems. 2. IndustrialGrade Performance The SM852B phase rotation meter operates within a 20Hz400Hz frequency range and withstands 2000V per minute. Its carefully engineered ABS housing ensures reliable performance in harsh electrical environments. 3. No Battery Required The phase sequence indicator draws power directly from tested circuits (200V AC: 60 min / 600V AC: 4 min). Its lowmaintenance design reduces downtime and environmental waste compared to batterypowered testers. 4. SecureFirst Design Features 22.4inch insulated test leads with sturdy clips. Complies with strict electrical safety standards for phase sequence detection in commercial buildings and industrial plants.