The Sm852b 3-phase Rotation Tester Digital Phase Indicator Detector Led Buzzer Phase Sequence Meter is a convenient tool designed to check the phase sequence and indicate if the phase is open or not. It is a reliable device that guarantees safety and reliability with its clips that easily involve the terminals of the control panel. With a wide voltage test range of 60V to 600V AC three-phase voltage, this tester offers high performance. It is easy to use with its LED light that shows if the phase is open or not, and it also supports buzzer indication. The portable design of this tester makes it small and lightweight, allowing for easy carrying. Made of plastics and metal, this tester operates at a voltage range of 60V to 600V AC three-phase. It has a limit support voltage of 2000V/minute (impulse voltage 4000V) and operates at a frequency of 20Hz to 400Hz. The limit time for continuous use is 60 minutes maximum at 60V-AC and 4 minutes maximum at 600V-AC. The Phase Sequence Indicator LED on this tester has a green light for correct phase sequence with an intermittent beep, and a red light for reverse phase sequence with a continuous beep. The dimensions of the tester are 85 * 64 * 23mm / 3.3 * 2.5 * 0.9in and it weighs 120g / 4.2ounce. The package dimensions are 120 * 100 * 50mm / 4.7 * 3.9 * 2.0in and it weighs 200g / 7.1ounce. Package includes: 1 * Phase Indicator Key Features: Checks phase sequence and indicates if phase is open Wide voltage test range of 60V to 600V AC three-phase LED light and buzzer indication for easy use Portable design for easy carrying Reliable and safe with clips for terminals Phase Sequence Indicator LED with green and red lights Dimensions: 85 * 64 * 23mm / 3.3 * 2.5 * 0.9in Weight: 120g / 4.2ounce