When ScubaLab put the Mikron on the ANSTI breathing machine, it pumped out lots of air, even at extreme depths and breathing rates. Built for traveling, the Mikron features a balanced-diaphragm first stage that isn’t much bigger than a golf ball, a compact, pneumatically balanced second stage and an ultra-light, ultra-flexible braided hose. The user-control knob offers about one-and-a-quarter turns of adjustment and, when fully closed, it does an excellent job of preventing surface free flows.