Current Measurement, Monitoring and Protection for Electrical Wiring and Equipment, Current and Power Measurement for Electric Motors, Lighting, Air Compressor, Heating and Ventilation System, Air - Condition Equipment and Automation - Control System, Current, Power and Energy Monitoring Device, Relay Protection Device, Wide Inner Window, Allowing Clamping of Big Cables or Bus - Bar, Clamp - On Design, Fastening Safe, Easy to Install, Portable.