[5-in-1] Portable Carbon Monoxide Detector for Travel Mini CO Meter Integrated [CO Atmos Altitude Temperature Humidity Sensors] 6-Day Battery Life for Camping Climbing RV (Grey) 3

My review is perhaps premature since I just received this today. But the device has a bit of heft in hand, which tells me it’s filled with content. I missed the fact that the detector comes with a 128 MB SD card. Instructions are dinky in font size, but still legible and clear. Read them tho’! While jury is out wrt quality and accuracy it offers a lot of functionality for the price. This was the only CO detector to offer a history of activity via the SD card. I’d give it a try if you are in the market for such a device.Update: I’m still impressed with this CO detector. It is important to thoroughly read through the instructions. One thing to understand if you plan to read the data stored on the SD card. It was this feature and capability that drove me to purchase this CO device. Also, read the separate leaflet about proper testing of the unit. The unit only writes to the SD card at 5 minute intervals, which is more than ample to provide a meaningful history over time. But when you test the unit for CO, the data may or may not be registered on the SD card. It depends if the unit was sampling at one of the 5 minute collection points. The display is reading real time, but it may not be captured on the SD card if the CO is just a short burst of some sort. But obviously if there is a CO concentration that persists for a period of time greater than 5 minutes, it will be captured and stored on the SD card.The SD card must be popped out to be read separately by a PC. The USB-C port on the side is only for charging the battery. CO and the other four metrics are stored on the SD card as separate daily files using the csv (comma separated variable) format. If you want to further process the data on your PC, you can ‘Save As’ an xlsx (Excel) extension file. This capability can prove very handy for those wanting to diagnose CO problems.Also, you can put in a larger SD card if needed. However, 128 MB should be plenty for most.To reset/adjust the date and time, while the unit is still On, remove and replace the SD card. This activates the date/time setting mode. Short pressing the Pwr button selects the year, date and time. The A & B buttons are respectively the ‘up’ and ‘down’ adjusters.The unit can be left plugged into the charger if you want to keep tabs on CO, say in your house or out building. The device should be left upright for best monitoring. There are ‘sniffer’ holes on the back and sides of the monitor that should be fully exposed.Great little instrument. I hope it can last for awhile.