Description: The current level if this supply is a container; the remaining space if this supply is a receptacle. If this supply container/receptacle can reliably sense this value, the value is reported by the printer and is read-only; otherwise, the value may be written (by a Remote Control Panel or a Management Application). The value (-1) means other and specifically indicates that the sub-unit places no restrictions on this parameter. The value (-2) means unknown. A value of (-3) means that the printer knows that there is some supply/remaining space, respectively. Additional information: The LJ 9000 has two features associated with the Black Cartridge. One is called Toner Level Sense (TLS) the other is OPC Life Measurement which determines the life remaining the the OPC Drum. Both of these values are stored as Percentage Life Remaining. These percentage life remaining values are combined and then converted into number of impressions based on the number returned via prtMarkerSuppliesMaxCapacity and made available via this PML object. The calculation assumes 5% coverage Letter/A4 pages.