ResOne Standard Liter Meter Pen: Measure Oxygen Flow Rates Up to 8 LPM - Compact Oxygen Flow Meter for Quick, Precise Flow Checks

Real handy if you’re an oxygen user. Assures the proper flow of O2.

Got this to check my CPAP machine pressures and my oxygen concentrator pressure. Does a really good job. Highly recommend.

I have two of these gauges. They do agree with each other. They also show the same reading that’s shown by the flow meter on the oxygen concentrator. I use the gauge to make sure that the oxygen is flow rate as delivered at the CPAP intake is what the doctor ordered.

Wow ! Easy and great. I use it to check oxgen level in tubing.

If you are curious or feel you just want to be sure you getting the right O2 flow to your cannula this pen does the trick. I put in a pseudo-valve wye at my concentrator to aid with my hose management. I setup one to the bedside and one to the living room. I wasn't sure I was getting the correct flow to the living room due to having more hose to that area. This pen allowed me to confirm my flow to both locations. It's just an engineering thing.

This item is just as described . Clear tube with very clear & readable numbers. Exactly what in needed . When I ordered this I thought it was a bit pricey , but after I received it I knew I was wrong worth every penny .

thankful for the peace of mind this product gives

This works to see what flow rate is on end use point when on o2. Wish there was a way to know if corrct/accurate since it was sent in just a bag in shipment no padding so no way to know how accurate it is.

Pour mesurer l'oxygène sortante de mon concentrateur c'est parfait ... donne une excellente lecture du débit en utilisation ... je recommande ...

Literally a lifesaver for oxygen user, can measure what comes out off a long hose. Accurate and practical.