The Fluke 140 A-Bug Toner Probe is a specialized tool designed to detect hidden wires in walls during electrical inspections and testing. Made by the reputable brand Fluke in the United States, this unit is a reliable and accurate tool for professionals in the business and industrial sectors. With its model number 140, this toner probe allows users to easily trace wires and identify potential issues in walls, ensuring a thorough and efficient inspection process.