Feature:1. Simple Operation: We only need to connect the well insulated auxiliary clips included in the unit to the 3 phase circuit under test then the unit will indicate the presence of a phase break and phase sequence via LEDs and a buzzer.2. Accurate Detection: The phase indicator checks for the presence of both open phase and phase sequence by means of a designated LED and an audible buzzer. This handheld instrument correctly identifies the rotating field of a 3 phase system.3. Limit Time For Continuous Use: 200V AC up to 60 minites, 600V AC up to 4 minites. Maximum Withstand Voltage is 2000V per minute (impulse voltage 4000V)4. Measurement Frequency Range: The phase sequence tester has a defined frequency range of 20Hz to 400Hz and this making the outcome more accurate.5. Battery Free Design: No need to charge when using. Energy saving and environmental protection. This phase indicator will not lead to pollution.6. Anti Electric Shock Protection Clip: This product is equipped with 3 protective clips to prevent users from being electrocuted by accidental touch during measurement.Specification:Name: 3 Phase Sequence TesterMaterial: ABSColor: Red, BlackFrequency Range: 20Hz~400HzTest Wire Length: Approx. 570mm/22.44inContinuous Use Time: 200V AC up to 60 Minites, 600V AC up to 4 Minites..Package List:1 x 3 Phase AC Sequence Meter3 x Auxiliary Clips1 x Storage BagNote:1.This phase sequence tester is not allowed to be used outdoors in a wet environment when it rains to avoid unsafe accidents.2.Do not expose the instrument to water or other corrosive liquids, and do not place it in direct sunlight or high temperature and high relative humidity environment to avoid affecting its test performance.