sometimes it may take longer than 3 tho, in my case it took a little over a week but it will get to you and as far as ive seen and read they all work like champs in a vacuum test. i recommend them
I ordered one on Wed., can't wait to get it. I was going to get the Alt1, but I just got an altimeter 1 from Apogee, so when that gets lost, I guess these will be the replacement, you can get two for the price of one.
Matt