Yeah i keep meaning to order a 0-20l scale/tube for mine as the resolution with 0-34l is a bit pants. I didn't know you add more flowmeters to optimator regulators when i bought mine but i still would've kept things seperate and use a Y splitter... took several weeks for the thing to arrive and if i ever manage to damage it there's zero chance of popping down to the LWS and being back in business within an hour or two. With a Y splitter i can just swap out the damaged flowmeter or reg with whatever is to hand or available from the LWS to tide me overNext one I get I'm going to be very specific about the scale on the flow tubes. I know they do a nice finer scale. It's the only let down on the whole thing. I love the whole intergrated thing as you know. You can buy the flow tubes separate for them as I added my purge line this way. I phoned them directly and ordered it. You can put as many tubes as you like on them.
ETA while they're 'kin spendy as soon as you play with a GasIQ optimator reg or flowmeter in the flesh they feel much better value for money as they're beautifully made and finished.