IEC 61987-16:2016 provides an
- operating list of properties (OLOP) for the description of the operating parameters and the collection of requirements for a density measuring equipment, and
- device lists of properties (DLOP) for a range of density measuring equipment types describing them.
The structures of the OLOP and the DLOP correspond with the general structures defined in IEC 61987-11 and agree with the fundamentals for the construction of LOPs defined in IEC 61987-10.