  Exact conditions on the clock parameters corresponding to the minimal
uncertainty in distance measurement are derived in uniform manner for any
number of space time dimensions. The result espouses the holography principle
no matter what the number of space time dimensions is. In this context the ADD
braneworld model is considered. Some remarks are made on deviation of
holography as well as of special relativity at the scales provided by the
cosmological constant. We also comment on the potential influence of the
background radiation on the uncertainty in length measurement. The presence of
unavoidable quantum uncertainty in length measurement results in fluctuations
of the black hole thermodynamics that can be interested to address the
information loss problem. The quantum corrections to the black hole entropy
obtained in various scenarios are imperceptible because of these fluctuations.
At the Planck scale the fluctuations destroy the thermodynamic picture of the
black hole.
