Feature: 1. Highly reliable, it can check a large range of 60V to 600V AC three phase. The instrument guarantee high reliance and performance. 2. The appearance is exquisite and beautiful, small size, light weight, with carrying bag, portable, easy to carry and use, 3. 5pcs LED lights illuminate to indicate, the test result is clear at a glance. Fast and accurate measurement, efficient, effective. 4. Environmentally friendly design, no need to use batteries. The time limit for continuous use is 60 minutes at 200V AC and 4 minutes at 600V AC. 5. The test lead is double insulated and safe to use. As a general measuring tool, it is widely used in schools, laboratories, families and other fields. Specification: Item Type: Phase Sequence Meter Material: ABS Color: As shown in the picture Product Model: SM852B Working Voltage: 60V ~ 600V AC, three phase Limit Support Voltage: 2000 V/min Operating Frequency Range: 20 Hz ~ 400 Hz Limitation time for continuous use: Maximum 60 minutes at 200V AC, Maximum 4 minutes at 600V AC Test Lead: Double insulation Test Lead Length: Approx.70cm/27.5 in . Package List: 1 x Phase Sequence Meter 3 x Crocodilian Clip1 x Instruction Manual1 x Storage Bag Note: 1. The meter is a high voltage test equipment. It is necessary to observe whether the meter is in good condition before use. If the following conditions occur, you must stop using it and perform corresponding inspections and repairs to avoid electric shock and unsafe accidents.A: The appearance of the meter is obviously damaged (such as cracks or damage in the shell, broken skin on the test lead, etc.).B: The meter was severely squeezed during transportation.C: The meter has been idle for a long time under improper conditions (such as in the bathroom or a relatively humid place, etc.).2. Never open the case of the meter during the measurement process to avoid electric shock and unsafe accidents.3. During the measurement, there is a large voltage input from the test lead. Do not touch the bare wire or the metal part of the test lead directly with your hands to avoid electric shock.4. Although sometimes all the phase indicators are not lit, but there is still a voltage loop, pay attention to prevent electric shock.