This chapter provides a description of the BTS Master models MT8221B and MT8222B. It also reviews preventive maintenance, calibration requirements, ESD cautions, and additional documents. general and performance specifications, instrument options, standard accessories, and optional accessories are in the BTS Master MT8221B/22B Technical Data Sheet (PN: 11410-00442). Refer to Measurement Guides, for additional information. Throughout this manual, this instrument may be referred to as the BTS Master, or MT8221B/22B.