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 to 1000 V. 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.