USA NIST Calibrated 4 Gas Monitor by Forensics | O2, CO, H2S, LEL | USB Recharge |

My original review is below. The first unit I received had a bad 02 sensor. Sarah reached out to me and within a few days I received a replacement unit. No issue with the replacement, customer service was willing to help and now everything is all good. Thanks Sarah and all at Forensics Detectors. I am sure that I will be purchasing other equipment in the future.I have no idea if this device is easy to use or not. Value for the money certainly does not seem to be there, and accuracy gets a 0% from me right now. The unit I received went into alarm mode when turned on for the first time and will not reset or clear. Display indicates 02 level at 0.0%, which I have to assume indicates a sensor failure or some issue with the equipment. I have sent emails, but so far I have received NO response at all. I understand that equipment fails sometimes, but with 0 time on the equipment? I am not sure that is an acceptable time between failure. Hopefully this company will reply within the next couple of days and this can be resolved.Update on this issue. Customer Support contacted me and is shipping a new unit to me, I will advise further when new item is received.

I’ve had this for just over a year, and it has performed flawlessly. It’s important that safety devices work all the time. I wish more companies sold quality products like this one.

Easy to use and works well for confined space entry. The only negative is that the calibration cap has to be screwed on which is ok but the screw does not stay contained on the cap and can be easily lost. It would be nice to have a retainer clip on the screw so it is not lost from the cap or a design of a clip on calibration cap for the unit. It's not a deal breaker for the price but if something better comes along it would be nice.

This was purchased to replace a broken, very expensive, industrial model. It works just as well and is very accurate, for a fraction of the price....as a matter of fact, this was dropped in water and stopped working. After drying it out, it worked like a charm at the same great level of accuracy. No complaints!

Very Easy to use/read. No complaints!

Our residential home had a confirmed gas and mold leak with the State and legal authorities involved. We purchased this device months ago. This device NEVER picked up the leak. Do not fall for this. It is a rip off. A certified company came out and confirmed with their air control testing the home indeed has toxic chemicals. This device NEVER picked it up. Do NOT waste your money!!!!!

It's plenty sensitive. The only thing it lacks is a calibration kit

I’ve bought 8 of these, much cheaper than some of the alternates but this still has all of the good stuff to go in confined spaces