The Milwaukee 10-1000V Dual Range Voltage Detector is the first Non-Contact Voltage Detector with the ability to Light Up, Detect, and Differentiate Automatically. The expanded sensitivity range of 10-49V offers the ability to detect voltage in common systems that would normally go undetected when using a standard voltage detector. These systems include: LED Lighting, Fire Detection & Suppression Systems, HVAC Controls, and Security & Access Controls, along with many others. The 10-1000V Dual Range Voltage Detector not only detects, but also differentiates 10-49V from the standard voltage range of 50-1000V. It does so by using a uniquely colored LED indicators and audible tones, delivering the clearest indication of these two voltage ranges. A built-in LED work light allows for increased visibility in low-lit areas, and automatic shut-off after 5 minutes helps preserve battery life. The 10-1000V Dual Range Voltage Detector is a best-in-class voltage detection solution for any Electrician, HVAC Technician, or Facilities Maintenance Technician.