Features A indicator with two functions: Check the phase sequence and indicate whether the phase is open. Wide voltage testing: The indicator can check three‑phase AC voltage from 60V to 600V, with excellent performance. Easy to use: The LED light can show if the phase is open and it supports buzzer indication. Safe & reliable: Equipped with clips, easy to contact with the terminals and ensure safety and reliability. Portable design: small and lightweight, come with a carrying bag, convenient to take wit h you. Specification: Model: SP8030 Operating voltage: 60 V~600V three-phase AC voltage Measurable frequency range: 20Hz~400Hz Using time for continuous measurement: 60 minutes maximum at 200V AC 4 minutes maximum at 600V AC LED indicator functions: Green for the correct phase sequence, intermittent beep Red for reverse phase sequence, continuous beep Item Size: Approx. 85 x 64 x 23mm / 3.3 x 2.5 x 0.9in (Excluding test wire) Weight: Approx. 240g / 8.5oz   Package list: 1 * Phase Indicator 3 * Clips 1 * Bag Package List