How do i do a Countif < than var1 and var2?

eg. Countif var1
=COUNTIF($T:$T,"<" & $C2)

I have tried Countif var1 AND < var2 as
=COUNTIF($T:$T,AND("<"&$C2,""&$C3))

where $C2 = var1 and $C3 = var2

Bruce