Hello,
I found this emulator from Google quite useful and it is even free
https://developers.google.com/chrome...bile-emulation
You just have to install a new version of chrome called Chrome Canary and use its dev tools. I now have two versions of chrome installed with no problem at all.
Hope that helps 
the emulation i see in this is different than what i see in browserstack.... My LP looks fine in browserstack, in this emulator is doesnt.... Which should i believe?
I have not tried browserstack to be able to tell you, but most of the LPs I check around the web with Chrome's mobile emulation look correct.
Are you doing some fancy stuff? Have you tried checking the LP with your own mobile and comparing with the tools?
my mobile (iphone5) and browserstack match up... With this emulator they dont... I always check with my iphone 5
Well then don't use it, I just wanted to help 
i just ran into protofluid.com as well.... Good to look at, but also seems different than browserstack.com; at this point i dont know why they are different....
Browserstack, as I understand it, is doing rather more sophisticated emulation than Chrome or similar things. I don't know the details but I do know that Browserstack is more often 100% accurate than any other emulation option I've tried.
My usual approach is to do quick-and-dirty tests using Chrome, but if I really want to get something 100% right, I use Browserstack.
The chrome emulation is also really nice to snoop on mobile ads. Just pop that puppy into an android or iphone and go crazy. I found it to be really handy for that. I did notice the iphone discrepancies as well though.
I was playing around with it yesterday on my site/LP's, but it seems to be working now
. How about that! Kinda strange. The resolution was messed up yesterday though. I'm not sure what changed.
I 've tried these two emulators, but neither have iPhone5 right. Which is very annoying. For the other screens & phones it works great.
http://ami.responsivedesign.is/
http://www.responsinator.com/
Have you tried the one I gave in my first post for iphone?
http://www.springbox.com/mobilizer/
another handy one
No need to install another chrome, I can also emulate mobile with my regular chrome 
What i do is make a simple php file with various sizes of iframes in, so you edit your lander, click refresh, bam, see what it instantly looks like in a dozen or more resolutions
simple-isms.