ResOne High Flow Liter Meter Pen: Measure Oxygen Flow Rates 2-15 LPM - Compact Oxygen Flow Meter for Quick, Precise Flow Checks

Does exactly what it's described to do. Wanted a measure just to have for our oxygen machine and saw the original tech who installed it had one. Easy to read and works perfectly.

This little pen is easy to use and is accurate

General quality seems OK. It does not seem able to be set up for permanent monitoring. It seems to be a quick check gauge. The 15 l version has a minimum reading of 2 l/min. If you want to check a flow rate slower than that, then the 15 l device is the wrong tool for the job. Other versions, for lower flow rates, are available.

I used this to check the oxygen from my concentrator to the end of the tubing which was 50’. Levels stayed very close.

I like this fairly cheap tool to check the oxygen flow that I'm getting. You have to be aware that it checks only the flow pressure, not quality of Oxygen coming out. I use it because sometimes I'm concerned if there is a crack in the tubing, or bad seal and letting the oxygen leak out giving me an incorrect amount of oxygen. I have to report that it is dead-on for accuracy. The ball is the same as the O2 concentrator level reading in the hallway and my nose canula in my bedroom. Glass construction and heavy metal ball. Well made.

It works rather well and accurate. I am a COPD patient and use O2 a lot during each day.

I use it for my hydrometer testing, great tool

As an oxygen user, it's a simple, handy and convenient way to check the flow. Lets me compare the flow at the tube end with the numbers on the concentrator.

Works as described and very accurate with Continuous flow hose, But does not work well with Pulse Flow as it is intermittent flow and does not read properly.