OXYGEN Analyzer by FORENSICS | 0%-100% with 0.1% resolution | Scuba, Nitrox, Divers | Water Resistant Case |

The O2 Analyzer works great. It is easy to use and the way it passes air over the sensor is far simpler than any other analyzer that I've ever used. Just shy of 2 years the analyzer starting giving clearly erroneous measurements. I contacted Forensics and returned the device to them, apparently the sensor had failed, even though it was out of warranty they sent me a new unit. Couldn't be happier.

Nice to check O2 on equiment.

Bought this item on May 22, 2026. Have only used it 3 times. EACH time the O2 analyses was off from Dive shop analyses by 3.0 % O2. Registers calibration at 23.5 % O2. Cannot be used as my scuba analyzer for Nitrox. This needs to either be replaced or refunded. Please advise. JNW

I ordered the detector in June but didn’t use it until September. The readings I got were much different than the dive shops. When I got home I contacted Forensics customer support and they sent me a new one within a few days. The new one works fine. Forensics customer support was very helpful.

If you use O2 for any use, This product is a must. Easly to use. Check your medical devices, such as O2 generators to make sure the give you the right amount of O2

Worked fine when first purchased. Quick and easy to analyze mix. Used on two dive trips then put away for 6 months with batteries removed. Then it would not calibrate to 20.9% . Used new batteries still not working properly. I think the sensor may have died. Contacted manufacturer through their website e mail. Sarah got back to me within one day with a recommendation to fix issue. When that didn't work she immediately arranged for a replacement unit, which I received within a week. A good product but even better : Great customer service!!

I got this device on Tuesday, fast shipping and good delivery time. My only concern is when I opened the box, the device looks like was used for plenty of times before gets into my hand! There are tears and scratches on screen, and I was sure it was not brand new! These O2 analyzers internally works with Galvanic chips , and even if the device sits on shelves, it wears the sensor off! So I don’t know how long it would work! Also, the manufacturer did not place the sticker regarding the date the Galvanic chip was manufactured and placed into the device! Because of these reasons, I will return the device!

This works well to test the O2 concentration right from the line of the oxygen concentrator and also to test the ambient level of O2 in the cage we set up to be an O2 chamber for our special care pets. I've accidentally left it on a few times for a couple hours and the batteries haven't died. This amazes me since it must be doing quite a bit of work. The mechanics must be fairly efficient. I like to color, the font size, the simple buttons. I wish the face lit up (maybe it does- I didn't read the manual) so we could read it from outside the cage. What would make it even better for out purposes would be a remote (hardwired would be fine) display or a way to set a chime if O2 level rises or drops out of the selected range

En tiempo y forma, solo le pondría una esponja para protegerlo y una guía rápida de uso, pero esta muy practico

Perfect analyzer for the price point really happy with it. Works extremely well for dive cylinders. N.B Fedex deliver this item to UK from Greece and charge you almost £46 ontop of the purchase price, which Amazon do not tell you so be aware of this fact when ordering

Excellent analyseur pour le prix, je recherchais un analyseur capable de lire au-dessus de 25% et celui-ci le fait.