Small and convenient: rotary field tester with instant storage and port kit, compact size, lightweight, easy to carry. Function: Measures three-phase electricity with a frequency range of 20 Hz to 400 Hz; efficient, reliable, and simple to operate. Easy to use: Features two function indicators to verify phase sequence and detect open-phase conditions. Wide voltage test: Detects three-phase AC voltage from 60 V to 600 V. LED indicator shows live phase status; buzzer provides audible feedback. Design: Green LED indicates correct phase sequence with intermittent beeping; red LED indicates reversed sequence with continuous beeping. Includes three clamp cables. Continuous use: Up to 60 minutes at 200 V AC, up to 4 minutes at 600 V AC. Specifications: Model: SM852B Operating voltage: 60 V – 600 V three-phase AC Maximum dielectric strength: 2000 V/min (voltage pulse current 4000 V) Measurable frequency range: 20 Hz – 400 Hz Meter size: 85 × 64 × 23 mm (without test leads) Weight: Approximately 200 g Item Type: Phase Sequence Tester Material: Plastic Package Contents: 1 × phase sequence tester kit Note: Color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.