HAKKO FX-791 soldering iron flow meter with valve

Flow meter for soldering iron with valveHAKKO FX-791Flow meterCompact and space-savingPrecise setting level now from 0.25 l / min.(Recommended flow level is from 0.5 l / min. Up to 1.5 l / min., Which should be adjusted according to the shape of the tip.)Example of useSet the flow rate with the gas flow control knob. Open/close the N2 gas with the gas drain valve.