Portable Oxygen Concentration Content Tester

This Oxygen Analyzer is a good value, and it does work as described even without the English instructions. Initially go to the 0-50% range, attach the rubber bulb and filter tubes as shown in the picture, and slowly compress and relax the rubber bulb pulling air (a vacuum) thru the sensor from the filter tube. Be patient, while adjusting the calibration knob, allow the reading to settle for a few minutes at 21.0% (Nominal Oxygen content of about 25 deg. Celsius air and 50% relative humidity). Then you can hook up your Oxygen Concentrator to verify that it is working properly with a proper Oxygen percentage. I personally would not force air through the sensor module to anything over 5 liters per minute. (Nominal high setting on most Oxygen Concentrators for home use) Also, I would not get any water or high moisture content air in the sensor. Only normal room temperature air at normal humidity levels. Keep in mind that the sensor has a finite useful life, possibly 2 years, maybe more. Anyone that can elaborate on usage and care of the sensor, please enlighten the rest of us. So far the meter and sensor is a good product at a reasonable price for personal home or hobby use.

Useless for what you need.

double check oxygen concentration produced by an O2 concentrator for an individual with a medical condition requiring supplemtal O2. Gives what seems to be an accurate reading, as checked against evaporated LOX.Bad - unit was was set to 50% when it arrived. Battery was dead. tricky to get dead battery out of compartment. no rubber plus present as described in interactions. made a loop out of old O2 hose, which we have a lot of, plug both nips on O2 sensor..

Yes, shipping time is from China, but arrived on the date which Amazon estimated before sale.Yes, received instuctions in good-enough english. Simple enough anyway. There are two connecting ports to the meter. Did not say whether / which connection is preferred, for the hand pump (output) and suction (input) for the little test chamber. It probably does not matter. The two together just draw a sample of gas into the test chamber.Tested with oxygen sources: room air, and two other supposedly higher o-2 concentrations. I have no data on the actual concentration of those two, but the meter did show about 2x room concentration for each. So that looks about correct. Cheers

The meter is exactly what is shown. It came undamaged and seems to work as it is supposed to.The biggest problem was getting it. The first one disappeared during the Covid pandemic and I was not allowed to request a replacement until a week after it was supposed to be delivered. The replacement could have taken another 60 days, but I got it yesterday. Ordered on 3/10/2020 and got it on 6/30/2020. I really can not blame shipping on the seller, but at close to $100, I was not happy that it took so long to get it. The instructions were adequate, but not great. I listed it as an average rating because it does a decent job but does not blow my socks off.

I purchased one of these testers 2-3 years ago to test the output of oxygen concentrators. It worked fine for a while, but after a few months the tester stopped registering an oxygen level. I found out that oxygen sensors have a finite lifetime, and it needed to be replaced. I spent the last two years trying to find anyone, anywhere, that sold the replacement sensor to make my tester work again. I found that they are absolutely not available anywhere separately, at least not that I have found. So while the tester does work, be mindful that it will only work for a short time. Then you will have to buy a new one. After two years of searching, and emailing vendors that were selling this tester trying to fine a replacement sensor, I wound up throwing it away.

Using it and scuba diving applications to mix nitrox. Measured it against my other two high-dollar oxygen sensors and it was spot-on. For the price that cannot be beaten

This is a very affordable meter. It appears to be accurate enough, although calibrating at 21% does result in relatively large measurement errors towards the 100% end of the scale. Instructions were sent in English. (Thanks!)I knocked off one star because shipping was extraordinarily slow. The promised arrival deadline was not met.