I used a Leica 1200 LRF for 15 years until I sold it this year and got a Leica 2000B... the 1200 worked down well below zero, no problem. The new Leica hasn't been pushed that low, but has worked in the teens this year no problem. As good as the 1200 was, the 2000 reads more quickly, has better optics, and is lighter.

“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery