Mettler Toledo XS Série Mode D'emploi page 8

Density determination kit for XS balances
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Remove the solid from the pan, close the draft shield doors and tare
the balance. Place the solid after in the holder (6). Ensure that no
air bubbles adhere to the solid (remove any air bubbles with a fine
brush).
Note:
With solids with a density less than 1 g/cm
solids (7) must be used as it holds the solid body below the surface
of the auxiliary liquid. If the buoyancy of the solid is greater than the
weight of the holder, the holder must be weighted by placing an
additional weight on the top weighing pan of the bracket.
After loading the additional weight, tare the balance and restart
the density determination procedure by first weighing the solid
in air (A) and then in the auxiliary liquid (B).
Wait until the balance has reached stability and note the displayed
weight B (weight of sample in the auxiliary liquid).
Now determine the density ρ ρ ρ ρ ρ of the solid according to the preceding
formula (Section 4.1).
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the holder for floating