Science Class magnetometer: a) outboard sensor, b) inboard sensor, c) boom with launch lock and hinge, d) electronics box. Mass total: 2308 g (incl. boom, harness and insulation), size of electronics box 155 x 142 x 98.6 mm3, size of one sensor ~ 67 x 67 x 42 mm3.
Source: http://sci.esa.int/science-e/www/object/doc.cfm?fobjectid=41526