negative value appears like possitive

[Pili Muñoz Gargallo]

hi all,
i am trying to get a value og the a signal in dBm, and it is negative, but
in the interface it appears like positive.
I am running nagios2.11 and  i  use check_snmp pluggin from nagios
pluggins-1.4.11.
i haver read the usage help but i didn't find any option to solve...
anyone knows if it is possible to solve it?
would be posible to add a constant to the read number?

thanks again
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