Oxygen Analyzer by Forensics | 21%-100% | O2, Flow & Pressure Digital Readout |

Very happy with this monitor. I bought it to check the productivity of my oxygen machine. I wanted to make sure it was putting out the correct amount of oxygen, that the flow rate was accurate and that the pressure was adequate for a 50ft tube. This did all of that. Very easy to use. Totally impressed with this item.

The product is easy to use and does not require manual calibration. One of the display modes shows oxygen concentration and flow rate simultaneously which is convenient.

This unit performed as expected. I used a portable aerosol can of oxygen, which showed 98%. The aerosol claims to be 95% oxygen. I went to my neighbor’s house and tested it on his concentrator and got a reading of 97%, which is what I expected since his meter said the same thing. Not too shabby.I like the overall build of this device. I used my label maker to put a label on this because it has a strange charging port compared to the more common USB types. It is unusual to see odd charging ports when most devices use a USB-style port.I am okay with being able to verify that the oxygen level is above 85%. I am not okay with the lifespan, lack of auto self-calibration, and the drift that comes important as the unit ages. Sensors are only suitable for several years and will drift out of calibration, which makes sense for the unit to self-test and alert the user that it is out of calibration.I will eventually require some devices later on and this is one of them. I am happy to learn new things and share this information.I read some other reviews. Generally, human medical devices are not sold on the open market without a prescription. I have added my findings regarding why.The "NOT FOR HUMAN USE" label on your oxygen analyzer likely means it hasn't been approved by a regulatory body (such as the FDA) for medical applications. Here’s why that might be the case:### Why It’s Labeled "NOT FOR HUMAN USE"1. Lack of FDA or Medical Certification- Medical-grade analyzers require rigorous certification (e.g., FDA, CE, ISO 13485) to ensure accuracy, reliability, and safety.- This certification process is costly and time-consuming, so some manufacturers only avoid it and sell their devices for industrial use.2. Not Calibrated for Medical Standards- Medical oxygen analyzers must be calibrated to strict tolerances.- Even small inaccuracies could affect patient safety if used in a medical setting.3. Potential Liability Issues- The manufacturer likely wants to avoid lawsuits if someone were to rely on an uncertified device for medical decisions.4. Sensor Quality & Long-Term Stability- Medical sensors must be highly stable over time. Your meter's lack of auto-calibration or drift compensation may not meet medical accuracy standards.Do All Certified Oxygen Devices Require a Prescription?Most medical-grade oxygen meters and analyzers require a prescription—but not all.Here’s the breakdown:- Medical Oxygen Analyzers (FDA-Approved) → Often require a prescription if they are meant for patient monitoring.- Industrial Oxygen Analyzers (Lab or Welding Use) → No prescription is needed, but they may not meet medical standards.- Calibration Gases (Certified Mixes) → No prescription needed, but must be sourced from specialty suppliers.Key TakeawayYour analyzer is likely accurate enough for checking oxygen concentrators, but it cannot be legally sold for human medical use without medical certification. If you need to verify general oxygen output, it’s probably fine—but for medical decision-making, a certified device would be required.

Specifically, I picked this up to check the oxygen level output of medical oxygen concentrators. Using my own concentrator, the flow reading matches the setting on the machine. My machine is producing 88% oxygen. I do not know if that is within spec. I tested a couple of neighbors concentrators and found similar readings. A power outage a few years ago caused me to wonder how well these oxygen concentrators work when operating on a square wave inverter. This would have been handy to see if oxygen output was compromised. Just tinkering around, I tried a couple of things. First, I blew into the test port. I expected the instrument would show 21% oxygen because that is the lower limit. Air exhaled from a human is less than 21%. Instead, the oxygen levels read all over the place, from 45% to 90%. I used compressed canned air to blow it out, and levels returned to normal. Thinking the humidity on my breath was the cause, I put a little water in a balloon, inflated it with a tire pump, and exhausted the air through the meter. The readings were higher than atmospheric, so I assume the difference was due to moisture.The unit is well-built. I like that it has real pushbuttons rather than those cheap membrane switches. The display is bright and easy to read. It is comfortable to hold, the hose barbs are metal. It seems to be a quality piece of equipment.

The device itself seemed to work well, but if you take a look at the charger, you’ll see it all in Chinese and it doesn’t have proper electrical prongs for the United States or Canada. Has solid prongs and does not have a UL marking or any US certification. I don’t believe that this is something that can be used in America so I will return it out of an abundance of caution :(

I am using this in my DWC hydroponic system.I use a oxygen concentration machine to supply my roots with oxygen enhanced air through air stones.This enhances root growth tremendously.This monitor seems to be working good although I have no was to check the accuracy.I am pleased, and I would buy this again.5 STARS

First, let me state that the instructions say that this is not for home oxygen use. My guess is that the manufacturer either does not want the liability or that it has not been federally approved for home oxygen analyzation.That being said I wanted to test on my concentrator anyway to make sure that it is functioning properly. I've been on oxygen for over three years. During that time my condition has slowly deteriorated gradually each year requiring a higher liters per minute (lmp) intake. Right out of the box, upon turning it on I got a oxygen reading of 21% which is in the correct range for normal air that we breathe. Upon attaching the oxygen tube from my concentrator to the analyzer, I saw the gauge quickly ascended up to 98% which tells me that my concentrator is working properly as it is giving me almost pure oxygen. That's a lot of piece of mind for me.As for the pressure gauge, I was not able to test that with my concentrator.The analyzer comes with a charging cable and a small brick at the end. It does not have to be plugged in to work. A 10" piece of tubing along with the instruction manual is also included.