The LEXXI T1660 is based on the RiserBond model RB1550 (Bicotest Lexxi T810). The device is popular due to its unbeatable price-performance ratio. Various additional filters and connection modules complete the package and simplify measurements on 50 or 75 Ohm test lines (accessories). The 25 Ohm mains voltage module even allows measurements on live three-phase power networks (accessory).