The Martindale Proving Unit PD690 with Voltage Indicator VI13700/G is a reliable and essential tool for test, measurement, and inspection in various industrial and commercial settings. With its trusted brand name and compact design, this unit provides accurate voltage readings and comes complete with a convenient carry case for easy storage and transportation. Ideal for professionals in need of precise measurements, the Martindale Proving Unit PD690 is a valuable asset for ensuring quality and safety in the workplace.