The Hioki PD3129-10 is designed to safely detect the phase sequence in three-phase circuits for electrical installation and maintenance. Conventional metallic-contact phase detectors are constructed with a voltage cable with standard metallic clips, requiring the technician to clamp onto exposed metallic parts of the conductor and introducing the potential danger of electric shock accidents and short-circuit accidents caused by accidental contact between two metal points. Needless to say, ensuring safety in electrical work has been an increasingly important issue. A long-standing proponent of safety at the workplace, HIOKI released the 3129 Non-Metallic Contact Phase Detector in 2004 and achieved the goal of ensuring a safe working environment for our users.To enable more electricians to take advantage of our advanced technology, we have increased the range of vinyl-insulated wires that can be clipped with the non-metallic voltage clips to up to 500 mm2 in size, and extended the operating voltage range to 1000V AC. With the all-new Phase Detector 3129-10, safe phase sequence testing can now be conducted in even more environments where the previous non-metallic-contact phase detectors could never be safely applied.Features:CAT IV 600V and CAT III 1000V safeSafe contact via the use of non-metallic clamp structureExtra-large clips lets you clamp insulated wires of up to 40mm in diameterBright red LEDs let you detect phase orientation even in dark locationsSharp buzzer gives audible recognition of phase detectionLine wire check function easily detects hot wiresCompact and lightweight - small enough to fit in the palm of your handAuto power-off function extends battery lifeLow battery state indicated by blinking LED