TopTes Guard-101 Gas Detector, 4 Gas Monitor for H2S, CO, LEL and O2, with Vibration, Visual and Audible Alarms, 14h Long Battery Life, Safety Explosion-Proof, for Work, Home - Orange

I purchased this a little over a year ago and it worked great. I tried it a few days ago and it was malfunctioning..... Contacted the company and they said that they were sorry and I would receive a new unit.... Three days later I got the new unit!! GREAT CUSTOMER SERVICE and They stand behind their Products... I will be a lifelong supporter of their products...

Very infrequently, I need to access an enclosed space. I did not want to spend the huge price demanded by other brands for something that would only get used once or twice per year. At this price point, I did not expect anything approaching this quality. It has the four most essential gas sensors, it is easily rechargeable, it is compact and easy to use, and it is accurate. Long term usage will determine its reliability. The display is quite visible, and the menu is easy to navigate. I took a minute to disassemble the unit and found the sensors are all readily available, inexpensive, and easily replaceable. That is a win for everyone. This earns the full five stars.

Meter worked great until it didn't. Used a handful of times then one day the O2 sensor went haywire. Contacted the company, tried to recalibrate unsuccessfully and they sent me a new meter. Customer service was very helpful.

As a volunteer fire fighter in a department with a limited budget I hoped this would be a reasonable choice to ensure my personal safety at a fire or accident scene. I bought this unit Jan 2026 and tested it for a week. Turn on the natural gas and it warned me right away, keep it close to the truck exhaust, off it goes... Great!! Then in April I clipped it on for the first fire that required "bunker gear." After a minute or so the unit started screaming at me, it reported 25% Oxygen in the air! Now I've been at a few fires where O2 levels were lower than the standard 20.9 but never on one where they were higher!!! Testing the unit after the fire it was clear that it was a goner. No LEL detection, no CO detection and O2 levels ranged between 25 and 15 percent. TopTes support appeared to be nice about it and at first showed me a video on how to reset the numbers and start clean. That worked for a few minutes basically, then the O2 would start to deviate up or down again. CO and LEL never came back. As for H2S I can't tell, no way for me to test that. Next they told me after a short email exchange that the unit would be replaced. But six weeks later nothing yet, so I wrote them again. They sent it through Amazon and USPS they told me, sadly the USPS tracking number they provided showed that the package was "awaiting pickup" in Houston. I think they simply generated a shipping label but never attached it to a package. In the following email exchange we went back and forth, back and forth. I was supposed to go to the post office and work with them to get my package, they blamed it on my PO BOX address etc etc. (I live rural, no mail delivery here!) Long story short, never got a replacement. I simply bought the competitors unit that has been working fine for me, even assisting me in measuring O2 levels in my NITROX mix when I go SCUBA diving. I chalked up the $100 dollars to a "learning experience" after I realized that the hours spent to get probably another problematic unit simply wasn't worth it. Hope it works better for you!

I have not had this for long enough to provide a useful review however I had a similar device possibly under a different manufacturers name and it did as I expected. The one thing about the previous version I had is that that I wish was different is that when the sensors expire...the bang for the buck it's cheaper to just buy an entirely new device. Side note, I feel these devices should only be used by someone who is properly trained in the limitations.

Update- originally liked it. I still do. Holds charge as advertised. I charge and use when I'm burning wood pellet/ wood stove to heat my trailer. Once the wood burn smoked out trailer and at 50 ppm it alarmed.

When I first turned this on it read danger level. Took awhile to shut off the alarm. Need better instructions on calibration. Unknown if this actually reads for deadly gases. Alarm is annoying. There is no off button for the alarm you have to navigate settings which is annoying.

Works great

Use this in mines, caves, tunnels etc. Good piece of kit. Feel safe with this

It worked fine for about a year, then it kept beeping as in it malfunctioned and it's now a brick. Ya get for what you pay. Get a Gas Clip folks, its all about safety.

Ottimo per il Mio lavoro, veramente top

Bewertung: Der TopTes Guard-101 Gasmelder macht einen sehr hochwertigen und zuverlässigen Eindruck. Besonders überzeugend ist die gleichzeitige Überwachung von H2S, CO, brennbaren Gasen (LEL) und Sauerstoff (O₂) – das gibt ein hohes Sicherheitsgefühl, egal ob im beruflichen Einsatz oder privat. Die Alarmfunktionen sind hervorragend umgesetzt: Ton, Licht und Vibration sind klar wahrnehmbar und lassen keine Zweifel, wenn etwas nicht stimmt. Gerade in lauten Umgebungen ist die Vibrationsfunktion ein großes Plus. Die Messwerte werden gut ablesbar angezeigt und reagieren schnell. Auch die Akkulaufzeit von rund 14 Stunden ist praxisnah und ausreichend für lange Arbeitstage. Das robuste, explosionsgeschützte Gehäuse wirkt stabil und langlebig, die auffällige orange Farbe sorgt dafür, dass man das Gerät nicht so leicht verlegt. Fazit: Ein professioneller, zuverlässiger und einfach zu bedienender Gasmelder mit umfangreichen Sicherheitsfunktionen. Sehr gutes Preis-Leistungs-Verhältnis und klare Kaufempfehlung 👍

Voilà plusieurs fois que je l'utilise en exploration sousterraine de carrières et mines abandonnées. Il semble précis et très pratique et n'a rien a envier à des alternatives plus "pro" et onéreuses que j'ai pu également tester. Cependant hormis pour l'O2, je n'ai pas encore pu tester les autres capteurs.