The Lot of 4 Tektronix Plug Ins includes the models 7A26, 7B992A, 7B53A, 7A18 These plug-ins are manufactured by the renowned brand Tektronix, known for their high-quality test equipment, made in the United States, plug ins are untested may or may not work, sold as parts units. Shipping via USPS on 15lbs from 04062.