Hi Kylerecon,
A manufacturer specific page number is a page number in the range 0xF0 - 0xFF. These numbers are used to indicate data pages containing proprietary data defined by the device manufacturer. Some manufacturers use these to transmit debug information, for example.
These pages can be interleaved between the normal device profile specific data pages for most sensors, providing the normal pages continue to be transmitted at a sufficient rate.
Let me know if it would be helpful to discuss,
Kat