The Martindale Voltage Indicator and Proving Unit Set is a reliable tool for detecting and measuring voltages up to a maximum of 600V. This contact voltage detector is designed by the trusted brand Martindale, ensuring accurate and efficient testing in various industrial and business settings. With this set, users can easily verify the presence of voltage and ensure electrical safety during inspections and measurements. Ideal for professionals in the field of electrical testing and measurement, this product provides essential support for maintaining electrical systems and ensuring compliance with safety regulations. in as new condition. Also includes one safety lock and panel keys.