Posted by a reviewer on Amazon

As soon as i got it i hooked it up to a hho cell ran the cell for an 12 hour then the scum on top of the cell got into the flow guage hurt my feeling to trash it right away flushed it out seems no harm came to it as far as accurate not sure but it does show flow and at this point im ok with the the measurements it gives until i need something more precise

Posted by a reviewer on Amazon

The nozzles are slightly large for standard us oxygen equipment

Posted by a reviewer on Amazon

I found that if i heated the ends of my cannula and o2 hose with a hair dryer they slid on easily and fit snugly2 accuracy can be a little off

Posted by a reviewer on Amazon

One consistently matched the flow meter of the attached concentrator and one was a half liter low at every flow

Posted by a reviewer on Amazon

It needs a lanyard to wear it around your neck its too heavy to just dangle from the cannula and there is no convenient way to attach one i tied my around the outflow nozzle4

Posted by a reviewer on Amazon

It shows air flow not sure how calibrated it is

Posted by a reviewer on Amazon

For general basic use should be ok

Posted by a reviewer on Amazon

The only issue encountered was that the connections are listed as 8 mm but are actually too small for 516 i