Providing of course that you only require one gas to flow at a time you will only need one Alicat MFM to fulfil all of your requirements. Standard instruments have 98+ gases pre-loaded so with the push of a couple of buttons you
would be good to go for each of your gases. For the extended range of your two flow rates this would be covered by
an Alicat 20 SLPM instrument as the 200:1 turndown would allow a lower measuring point of 0.1 SLPM.