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 200V to 480V, 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 crocodile 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. Features: 1. A indicator with two functions: Check the phase sequence and indicate whether the phase is open. 2. Wide voltage testing: The indicator can check three-phase AC voltage from 200V to 480V, with excellent performance. 3. Easy to use: The LED light can show if the phase is open and it supports buzzer indication. 4. Safe & reliable: Equipped with crocodile clips, easy to contact with the terminals and ensure safety and reliability. 5. Portable design: small and lightweight, come with a carrying bag, convenient to take wit h you.   Specification: Model: SP8030 Operating voltage: 200 V~480V three-phase AC voltage Measurable frequency range: 20Hz~400Hz Using time for continuous measurement: 60 minutes max at 200V AC 4 minutes max at 480V AC LED indicator functions: Green for the correct phase sequence, intermittent beep Red for reverse phase sequence, continuous beep Item size: 125 x 68 x 28mm / 4.9 x 2.7 x 1.1in Weight: Approx. 240g / 8.5oz   Package list: 1 * Phase Indicator 3 * Crocodile Clips 1 * Bag Package List