Thanks a lot at everyone for all the help 
My BAD, i have read again the Measurement
So i have a chinese camera that has this LED red that turn on only at the boot phase.
In this led i have 3 PIN
-
RED PIN (Used for the BOOT Phase)
-
GREEN PIN (Used After BOOT Phase)
-
"+" (Common) (LED PART)
-
"+" From Power Supply (For Power the ATTINY)
-
"-" From Power Supply (For Power the ATTINY)
In the BOOT Phase if i put the Multimeter to PIN + and PIN RED i have +1,76V and 1 mA
After the boot succeded i have 0,00.
My scope is to turn on one relay only if PIN+ and PIN RED are 0 (RED LED turned off).
Thanks a lot for all your help
Best Regards
Stefano