How big is Flow? Plume Labs Support Team June 21, 2019 12:53 Updated Follow Flow dimensions: 125 x 40 x 35 mm (Flow with strap) 56 x 56 x 33 mm (Dock) Related articles How long does the battery last? Is Flow waterproof? Waking up your Flow Do I need a smartphone and the companion app to use Flow? What pollutants does Flow measure? Comments 0 comments Please sign in to leave a comment.