Working! Tested with batteries. Batteries not included. The Tempo Sidekick T&N Cable Transmission Noise Tester is a high-quality and reliable tool for testing cable transmission noise and checking for leakage stress. Made by the reputable brand Tempo in the United States, this product is designed to provide accurate and efficient measurements for various cable testing needs. With its advanced features and durable construction, the Tempo Sidekick T&N Cable Transmission Noise Tester is a valuable asset for professionals in the field of cable testing and inspection.