Carbon Monoxide Detector CO Analyzer + Pump by Forensics | USA NIST Calibration | Water, Dust & Explosion Proof | USB Recharge | 0-1000 ppm |

Great product for the price. Great to have on hand if your a HVAC technician or even if you just want to check your own furnace.

Tested it with Bacharach and testo stuff it was accurate. Nice for the money

Make sure that you need something that measures under 1000 PPM. I got this to check forklift exhaust gasses, however, unless you have a pretty new forklift, it's almost certain to be over 1000 PPM. Another note, my first unit turned on the first time and then never worked properly again. If I plugged it in, it would just say charging, but never allow me to get to the menu (even after unplugged). That said, the return wasn't too hard. The unit seems easy enough to use, was surprisingly sensitive, and the vacuum pump portion seemed to be quite reliable.

As an commercial appliance tech,this has been a good tool to have on my van. Only had it a few months but have used it a few times,and it seems to work fine. Company guarantees its calibration

this unit is well build easy to use and good price point

They don't really make that part clear, pre-purchase. I do HVAC service in Colorado. Nearly every furnace installed here needs to be derated for the altitude. New pressure switches during the install, plus adjusting the gas pressure from the sea level factory setting. To do that, I use a meter in the exhaust to get the lowest CO reading possible while keeping the heat rise high enough to avoid condensation in the heat exchanger. If this can't handle exhaust gas it is useless to me. And, as another reviewer pointed out, it just seems cheaply made. Returned.

I have a generator used for power outages, which occur from time to time. I run the generator every few weeks, to try to be sure that it will start when it is actually needed. The generator is in the garage. I usually run it there, with main doors and side door open. Even with this ventilation my wife often complains that she can smell it in the house after a while (I can't). Decided to buy a CO meter to be safe. This one seems like a good compromise. It really is quite sensitive, and when the alarm goes off, you are not going to miss it! What it showed is that even with the garage doors open, the CO levels get too high very quickly. Interestingly, they vary depending on the location in the garage, with a higher concentration near the door into the house (probably due to through-ventilation missing that corner). It is somewhat better, but not perfect if the generator is moved to the open door, just inside the garage to keep it out of the rain with the exhaust facing out, but still quite unhealthy to spend much time in the garage. This meter is a really good tool for exploring and understanding your options with things like a generator. (BTW - in the house - zero ppm)

The unit is very easy to use and appears to be accurate.

doesn't work with most of the boilers as the probe head doesn't fit into the fitting tubular's chamber.

Delivery was delayed, otherwise the purchase was a positive experience