Quite possibly the most affordable way to get a spotter with a MIL-hash reticle and ED Prime glass - The Legend T-Series spotter gets it done. The built-in rail sections are perfect for mounting accessories like red dots and range finders.
Rainguard HD hydrophobic lens coating
ED Prime glass
Picatinny rail mounts
First focal plane
IPX7 Waterproof construction - O-ring sealed optics stay dry inside, when immersed in three feet of water for up to 30 minutes.