10.10 Allow sufficient time for the hydrometer to come to
rest, and for all air bubbles to come to the surface. Remove any
air bubbles before taking a reading (see 10.4).
10.11 If the hydrometer cylinder is made of plastic, dissipate
any static charges by wiping the outside with a damp
cloth. (Warning—Static charges often build up on plastic
cylinders and may prevent the hydrometer from floating
freely.)
10.12 When the hydrometer has come to rest floating freely
away from the walls of the cylinder, read the hydrometer scale
reading to the nearest one-fifth of a full scale division in
accordance with 10.12.1 or 10.12.2.