This Blender is designed specifically for use in the Neonatal Intensive Care Unit (NICU). It comes with a built-in close fit left side Flowmeter which flows from 1-15 L/min, and a right side Flowmeter which flows from 0.1-1 L/min. It also has a unique Flowmeter Bleed Switch which allows you to turn off the low flow gas bleed without disconnecting anything— simply rotate the right Flowmeter forward 45 degrees to turn off the bleed. Rotate the Flowmeter back to vertical to turn it back on.