This data set contains magnetic-field data acquired during the cruise and tour phases of the Cassini mission to Saturn. Data collection began on 16 August (day 228), 1999. On this date, two days before the spacecraft commenced Earth swingby, the magnetometer boom was unfurled into its extended position; a configuration it maintained for the remainder of the mission. This dataset contains the data collected from the helium magnetometer while in scalar mode (SHM). The SHM mode is used only when high fields are expected, this means that SHM data is only collected infrequently and ceased being collected after 17 November (day 321), 2005 due to an instrument failure.