The Martindale VIPD138-S Safety Voltage Indicator & Proving Device is a reliable tool designed for detecting and proving electrical safety in various industrial and commercial settings. Made in the United Kingdom by the reputable brand Martindale, this device operates within a DC frequency range of 1-400Hz and utilises a contact voltage detector type for accurate readings. Perfect for ensuring compliance with safety regulations and identifying potential hazards in electrical systems, this safety voltage indicator and proving device is a valuable asset for professionals in the field of electrical testing and measurement.