The MILWAUKEE Dual Range Voltage Detector is designed for commercial and residential electrical applications. The expanded sensitivity range of 10 to 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 Dual Range Voltage Detector detects and automatically differentiates 10 to 49V from the standard voltage range of 50 to 1000V. It does so by using uniquely colored LED indicators and audible tones, delivering the clearest indication of these two voltage ranges.