Select [...] (not) Exists

I have 2 identic tables: T1 and T2 which contain only one field NR.

T1 contains the data:
1
2
3
4
5
6
7
8
9
10
11
12

T2 contains the data:
5
6
7
8
A
B
C
D

I want to select all the records found in T1, but not found in T2. So, I wrote the following SQL query:

SELECT T1.NR
FROM T1
WHERE NOT EXISTS
(select T2.NR
from T2);

Unfortunately, this query doesn`t return any record. And the strangest thing is that the query:

SELECT T1.NR
FROM T1
WHERE NOT EXISTS
(select T2.NR
from T2);

have the same effect like:

SELECT * FROM T1,

I mean it returns all the records of T1. I mention that the query was written in Access. What I have to do? Can anybody help me? What solutions do I have? I need a query, not a VBA code!

Thank you in advance!