It's 2 conditional formats in B1.

cell value - is greater than =$A$1+0.01

and the second one

cell value - is less than =$A$1-0.01

and pick a nice colour.

Mike

"Teddy-B" wrote:

How (in conditional formatting) can I ask excel to allow a difference of +,-
.01? For example, A1=12.21 and B1=12.22. I want B1 to turn red if it is
not equal to A1, allow a .01 difference. In this case B1 will not turn red.

If A1=12.21 and (B1=12.23 or B1=12.19), then the cell (B1) will turn red.