Check the listing for details. type 3T77 sampling sweep unit Instrucation manual. Condition: Used. Listed at 26.00 USD. The type 3T77 sampling sweep unit instruction manual is a technical document that provides instructions on how to properly operate and use the unit. This manual typically includes detailed information on the functions and features of the sampling sweep unit, as well as instructions on how to perform various tasks and measurements using the equipment. It is designed to assist users in understanding and utilizing the full capabilities of the unit to ensure accurate and efficient testing and measurement processes.