Prism for long distance measurement
This reflector should do the job 😀 --
Good article, too--
Just about any reflector can tap 1500 ft.
I have 3 big older Lieca triples that stack into a 9 glass array. A triple hits 1000 m. And the 9 glass easily hits 2000 m with a Topcon GTS3B, and HP3805 3000 m.
Just Be sure to determine the offset of any older mirror. I have 28, 30, and 70 mm.