Garmin's website does not list the Montana 700 series as compatible with Tempe. I figured if it works with every other recent handheld it should work with my new 700i, so I ordered one. I can report it works very well and I've verified with other thermometers it is accurate between 80 and 123 degrees. I can't wait to test it between 50 and 80 degrees, mounted to my ATV, but it's August in the desert so that's just a dream for now.