14:19 <berndj> for the MEMS people: https://ifixit.org/blog/11986/iphones-are-allergic-to-helium/

14:52 <SpeedEvil> https://www.lambdaphoto.co.uk/srs-rga100-residual-gas-analyser.html - would be quite handy for a hobby project, but I'm not willing to spend more than $50. (small sealed environment life support test)

15:05 <Noxz> is that like the helium detector? for leaks?

15:06 <Noxz> also, I figured out the gearing for the differential rotary stage thanks to a perl script (or 3)..

15:06 <Noxz> able to do 6 arc minutes per revolution of a [hand] crank

15:06 <Noxz> which if hooked to a 280 step/rev stepper, than 2 arc second res

15:06 <Noxz> 180*

15:07 <Noxz> we're finally doing lathe work at school, so soon I will be able to make the gears

15:10 <Noxz> also, re residual gas analyzer, I have a high vacuum gauge that uses something along those lines ( number of particles, maybe the heater coil method thing, will check up on that later)

15:10 <Noxz> when I got my turbomolecular pump combo thing

15:19 <SpeedEvil> Noxz: It is a small mass spectrometer able to do a variety of gasses up to a modest molecular weight (1000?)