A multi-disciplinary test laboratory is a facility that performs a wide range of tests and measurements covering different disciplines and industries. As you mentioned, such a laboratory can specialize in Electrical & Home Appliances, Electronics & IT, EMI/EMC, Telecom & Wireless, Consumer Durable & White Goods, Solar PV, Photometry, Environmental, Energy Meters, and Mechanical testing. These test laboratories typically have a wide range of test equipment and facilities to perform different types of tests and measurements, as well as the expertise and experience to handle a wide range of projects.