One unit with Two functions: The instrument was designed to check the phase sequence. And at the same time， it has LEDs to show you if the phase is open or not.Alligator Clips: They can easily involve the terminals of the control panel to be tested， guaranteeing reliability and safety.Highly Reliable: it can check a large range of 60V to 600V AC three-phase. The instrument guarantee high reliance and performance.Functional Design: Small， light and portable. It was designed to facilitate the operation to the maximum.Specifications:Operation Voltage: 60V~600V AC three phase.Limit Support Voltage: 2000V/minute (impulse voltage 4000V)Operation Frequency Range: 20Hz~400HzLimit time for Continuous Use: 60 minutes maximum at 60V AC， 4 minutes maximum at 600V ACTest leads: Double insulation， with approximately 1 meter length.Front Panel Description:Open phase indicator LED-3 orange LEDs.Phase sequence indicator LED-Green for correct phase sequence， Red for reverse phase sequence.Band: Hitch on wrist to avoid the meter falling Meter penTest lads-Red for R phase(L1.R)， Yellow for Y phase(L2. S)， Green for B phase(L3.T)Color: black with orange sideDimension: 85*64*23mmNet Weight: approx 142gPackage include: 1* Main unit with test leads 3* Alligator clips 1* Instruction manual (english) 1* Zippered blue carrying casePackage dimension: 110*175*50mmPackage weight: 253g