Carbon monoxide detectors

Carbon monoxide detectors (or CO detectors) are important for safety, especially when sleeping in your vehicle or using any appliance that burns fuel. Look for certifications to ensure that it actually detects CO well, such as "USA NIST" calibration for portable meters or UL 2034 for home-style alarms. Note that CO₂ detectors (not CO) measure carbon dioxide, which is very unlikely to reach dangerous levels in any vehicle. Be sure you're buying the kind of detector you want. Products listed here are battery powered or car-outlet powered; plug-in (AC) models are usually cheaper but not as well suited for nomadic living. Many products detect multiple gases including CO, so if you want additional protection, consider a gas monitor instead of a CO detector.

Units: Both

Carbon monoxide detectors compared
Save	Product	Price	Brand	Model	Description	Manufacturer page	User manual	Popular brand	Min. CO detection (ppm)	Max. CO detection (ppm)	Resolution (ppm)	Gases detected	Response time (T90) (s)	Accuracy	Sensor type	Sensor life (years)	Built-in pump	Low alarm level (ppm)	High alarm level (ppm)	Alarm loudness (dB)	Adjustable alarm levels	TWA / STEL alarms	Charging time (hours)	Battery runtime (hours)	Battery capacity (mAh)	Charging port	Battery chemistry	Weight (lbs)	Weight (kg)	Length (in.)	Length (mm)	Width (in.)	Width (mm)	Depth/Height (in.)	Depth/Height (mm)	IP rating	Operating temp min (℉)	Operating temp max (℉)	Operating temp min (℃)	Operating temp max (℃)	NIST traceable calibration	ATEX / IECEx certified	Class I Div. 1 (UL/CSA)	UL 2034 listed	Certifications summary	Warranty
									Detection capabilities									Alarms					Charging				Core specs	Physical Attributes									Operating Temp Range				Certifications
	Aluminum Alloy Portable 4 Gas Detector, 4 in 1 Multi Gas Monitor Tester，H2S,O2,CO and EX Rechargeable LCD Display Gas Sniffer Alarm，Gas Clip Sound Light Shock Alarm (Grey)	$94.99	Sooguard	–	–	–	–	–	–	–	–	CO, H2S, O2 and LEL (combustible gas)	–	±5% F.S.	–	–	–	–	–	–	–	–	–	–	1,800	–	–	0.65	0.29	1.25	32	2.85	72	5.50	140	–	–	–	–	–	–	–	–	–	–	–
	BW Technologies BWC2-M	$132.87	BW Technologies	BWC2-M	–	Link	Link	–	0	300	–	CO	–	–	Electrochemical	2.0	–	35	200	95	Yes	–	–	17,520	–	None	Lithium (non-replaceable)	0.20	0.09	3.40	87	2.00	50	1.60	41	IP66/67	-22	122	-30	50	–	Yes	Yes	–	UL Class I Div. 1 Groups A-D, Class I Zone 0 Group IIC, ATEX, IECEx, CE, ABS, CU TR Ex	2 Years from activation, plus 1 year shelf life
	BW Technologies GasAlertMicroClip XL	$609.00	BW Technologies	GasAlertMicroClip XL	–	Link	Link	–	0	500	1	CO, H2S, O2 and LEL (combustible gas)	–	CO ±10%	–	5.0	No	35	200	95	Yes	Yes	6.0	18	–	–	Lithium-ion polymer	0.42	0.19	4.40	113	2.40	60	1.20	32	IP68	-4	122	-20	50	–	Yes	Yes	–	CSA Class I Div. 1 Groups A-D, ATEX, IECEx, CE, KTL, INMETRO, FCC Part 15 Class B statement	2 Years
	First Alert CO400	$21.99	First Alert	CO400	–	Link	Link	–	–	–	–	–	–	–	Electrochemical	–	–	–	–	85	–	–	–	–	–	–	–	0.70	0.32	5.00	127	3.40	86	1.50	38	–	–	–	–	–	–	–	–	Yes	UL 2034	7 Years
	First Alert CO410	$39.95	First Alert	CO410	–	Link	Link	–	–	–	–	–	–	–	Electrochemical	–	–	–	–	85	–	–	–	–	–	–	–	0.70	0.32	5.00	127	3.40	86	1.50	38	–	–	–	–	–	–	–	–	–	–	7 Years
	First Alert CO710	$44.00	First Alert	CO710	–	Link	Link	–	–	–	–	CO	–	–	Electrochemical	10.0	–	–	–	85	–	–	–	–	–	None	Lithium (non-replaceable)	0.50	0.23	0.94	24	4.75	121	2.63	67	–	–	–	–	–	–	–	–	Yes	UL 2034	10 Years
	FORENSICS DETECTORS FD Carbon Monoxide Meter & Pump	$169.45	FORENSICS DETECTORS FD	Carbon Monoxide Meter & Pump	–	–	–	–	1	1,000	1	–	–	–	–	–	–	–	–	–	–	–	3.0	–	–	–	–	–	–	4.30	109	2.30	58	1.70	43	–	–	–	–	–	–	–	–	–	ATEX	1 Year
	FORENSICS DETECTORS FD FD-4A	$215.45	FORENSICS DETECTORS FD	FD-4A	–	Link	Link	–	0	1,000	1	CO, H2S, O2 and LEL (combustible gas)	30	±5% F.S.	Electrochemical	2.0	No	–	–	–	Yes	–	–	20	2,000	Micro-USB	Lithium-ion	0.51	0.23	5.12	130	2.64	67	1.18	30	–	0	122	-18	50	Yes	Yes	–	–	ATEX	1 Year
	FORENSICS DETECTORS FD FD-4S	$265.45	FORENSICS DETECTORS FD	FD-4S	–	Link	Link	–	0	999	1	CO, H2S, O2 and LEL (combustible gas)	–	±5% F.S.	Electrochemical	–	No	50	150	–	Yes	–	4.0	20	2,000	Micro-USB	Lithium-ion	0.88	0.40	5.12	130	2.64	67	1.18	30	–	–	122	–	50	Yes	Yes	–	–	ATEX Ex ib IIC T4 Gb	1 Year
	FORENSICS DETECTORS FD FD-90A-CO	$99.45	FORENSICS DETECTORS FD	FD-90A-CO	–	Link	Link	–	0	1,000	1	CO	30	±5% F.S.	Electrochemical	2.0	No	50	200	–	Yes	–	3.0	24	1,500	Micro-USB	Lithium-ion	0.31	0.14	4.30	109	2.30	58	1.70	43	–	0	122	-18	50	Yes	Yes	–	–	ATEX	1 Year
	FORENSICS DETECTORS FD FD-101-CO	$99.00	FORENSICS DETECTORS FD	FD-101-CO	–	Link	Link	–	0	1,000	1	CO	60	±5% F.S.	Electrochemical	2.0	No	50	150	90	Yes	Yes	–	17,520	–	None	Lithium (non-replaceable)	0.25	0.11	3.60	91	2.10	53	1.30	33	IP67	32	122	0	50	Yes	–	–	–	CE	1 Year
	FORENSICS DETECTORS FD FD-103-CO	$98.00	FORENSICS DETECTORS FD	FD-103-CO	–	Link	Link	–	0	1,000	1	CO	–	±5% F.S.	Electrochemical	–	No	–	–	90	Yes	Yes	–	–	–	None	Lithium	0.33	0.15	4.30	110	–	–	–	–	IP67	–	–	–	–	Yes	–	–	–	CE	1 Year
	FORENSICS DETECTORS FD FD-D001	$139.50	FORENSICS DETECTORS FD	FD-D001	–	Link	Link	–	10	999	–	CO	–	±30% of reading	Electrochemical	7.0	–	25	50	85	–	–	–	–	–	–	Lithium (non-replaceable)	0.44	0.20	5.51	140	1.38	35	2.60	66	–	20	122	-7	50	–	–	–	No	–	1 Year
	Forsensal FS11301	$139.99	Forsensal	FS11301	–	–	–	–	0	1,000	1	CO, H2S, O2 and LEL (combustible gas)	30	–	Electrochemical	–	Yes	50	150	–	Yes	–	–	8	3,000	USB-C	Lithium-ion	0.70	0.32	2.36	60	2.60	66	5.75	146	–	–	131	–	55	–	–	–	–	–	1 Year
	HAOKESITE PLT840-4	$102.99	HAOKESITE	PLT840-4	A four-gas personal monitor for combustible gas (LEL), hydrogen sulfide, oxygen and carbon monoxide; it does not measure CO2. It alerts with voice prompts, a 120 dB alarm, vibration and light, runs on an 1800 mAh lithium battery and clips onto clothing. Built for confined-space and industrial work, it suits buyers needing gas-leak and oxygen safety rather than ventilation tracking.	Link	–	No	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	0.47	0.22	5.51	140	2.87	73	1.26	32	–	–	–	–	–	–	–	–	–	–	–
	HEIMAN C1-S	$28.99	HEIMAN	C1-S	–	Link	–	–	–	–	–	CO	–	–	Electrochemical	10.0	–	–	–	85	–	–	–	–	–	None	Lithium	0.23	0.10	2.76	70	2.76	70	1.46	37	–	40	100	4	38	–	–	–	Yes	ETL, UL 2034 5th Edition, CSFM	–
	HEIMAN HM-735ESY	$36.98	HEIMAN	HM-735ESY	–	–	–	–	20	999	–	CO	–	–	–	–	–	30	–	85	–	–	–	–	–	–	–	0.27	0.12	4.09	104	1.43	36	2.89	73	–	40	100	4	38	–	–	–	Yes	UL 2034 (5th Edition), CSFM approved	–
	HEIMAN HM-735ESY-T	$49.97	HEIMAN	HM-735ESY-T	–	–	–	–	20	999	–	CO	–	–	–	10.0	–	30	–	85	–	–	–	–	–	–	Lithium (non-replaceable)	0.27	0.12	4.09	104	1.43	36	2.89	73	–	40	100	4	38	–	–	–	Yes	UL 2034 (5th Edition), CSFM approved	–
	JuviPerpric IG-01	$134.99	JuviPerpric	IG-01	–	–	–	No	–	–	–	CO, H2S, O2 and LEL (combustible gas)	–	–	Electrochemical	–	–	–	–	–	Yes	–	–	–	1,800	–	–	–	–	2.00	51	2.70	69	6.00	152	–	–	–	–	–	–	–	–	–	–	–
	Kidde COB	$24.97	Kidde	COB	–	Link	Link	–	–	–	–	CO	–	–	Electrochemical	–	–	–	–	85	–	–	–	8,760	–	–	–	0.26	0.12	–	–	5.14	131	1.52	39	–	40	100	4	38	–	–	–	Yes	ETL Listed; UL 2034 5th Edition; NFPA 72; NFPA 101; FHA; HUD; CSFM	10 Years
	Kidde COBD	$30.47	Kidde	COBD	–	Link	Link	–	–	–	–	CO	–	–	Electrochemical	–	–	–	–	85	–	–	–	8,760	–	–	–	0.26	0.12	–	–	5.14	131	1.52	39	–	40	100	4	38	–	–	–	Yes	ETL Listed; UL 2034 5th Edition; NFPA 72; NFPA 101; FHA; HUD; CSFM	10 Years
	Kidde COBD10	$51.97	Kidde	COBD10	–	Link	Link	–	–	–	–	CO	–	–	Electrochemical	–	–	–	–	85	–	–	–	–	–	None	Lithium (non-replaceable)	0.28	0.13	1.40	36	5.14	131	2.83	72	–	40	100	4	38	–	–	–	Yes	ETL Listed; UL 2034 5th Edition; NFPA 72; NFPA 101; FHA; HUD; CSFM	10 Years
	Kidde COBDL	$40.47	Kidde	COBDL	–	Link	Link	–	–	–	–	CO	–	–	Electrochemical	–	–	–	–	85	–	–	–	–	–	None	AA battery (2 x AA, lithium not allowed)	0.26	0.12	1.52	39	5.14	131	2.83	72	–	40	100	4	38	–	–	–	Yes	ETL Listed; UL 2034 5th Edition; NFPA 72; NFPA 101; FHA; HUD; CSFM	10 Years
	Kidde COBDL10	$54.97	Kidde	COBDL10	–	Link	Link	–	–	–	–	CO	–	–	Electrochemical	–	–	–	–	85	–	–	–	–	–	None	Lithium (non-replaceable)	0.28	0.13	1.40	36	5.14	131	2.83	72	–	40	100	4	38	–	–	–	Yes	ETL Listed; UL 2034 5th Edition; NFPA 72; NFPA 101; FHA; HUD; CSFM	10 Years
	KLEIN TOOLS ET110	$129.99	KLEIN TOOLS	ET110	–	Link	Link	Yes	0	1,000	1	CO	60	±5% or 5 ppm, whichever is greater	Electrochemical	5.0	–	35	200	–	–	Yes	–	–	–	None	–	0.32	0.15	7.75	197	2.16	55	1.45	37	–	32	122	0	50	No	–	–	No	CE, CAN ICES-003 (B)/NMB-003 (B)	–
	LomakGlow 33700186A-Flashlight	$27.99	LomakGlow	33700186A-Flashlight	–	–	–	No	–	–	–	CO	–	–	–	–	–	70	–	–	–	–	–	–	–	–	–	0.42	0.19	1.71	43	3.23	82	7.83	199	–	–	–	–	–	–	–	–	–	–	2 Years
	MSA ALTAIR (10092522)	$225.57	MSA	ALTAIR (10092522)	A carbon monoxide (CO) detector, not a CO2 monitor, with alarms at 25 ppm and 100 ppm. It is sealed to IP67, runs maintenance-free for two years on its built-in battery, and alerts by flashing LEDs, sound and vibration while logging the last 25 events. UL and CSA listed for hazardous locations, it suits buyers who want rugged CO protection rather than ventilation monitoring.	Link	Link	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	0.24	0.11	2.17	55	1.61	41	3.47	88	–	–	–	–	–	–	–	–	–	UL, CSA, CE, Ex ia IIC T4, Class I Div. 1 Groups A-D, Class II Div. 1 Group G, IP67, FCC Part 15 and ISED/IC statements	2 Years from activation
	NOYAFA JMS19	$96.98	NOYAFA	JMS19	–	Link	Link	–	–	–	–	CO, H2S, O2 and LEL (combustible gas)	–	98%	–	–	–	–	–	–	–	–	–	–	1,800	–	–	0.55	0.25	3.94	100	1.18	30	7.87	200	–	–	–	–	–	–	–	–	–	–	–
	Sensorcon AV8-CO-03	$194.00	Sensorcon	AV8-CO-03	–	Link	Link	–	0	500	1	CO	20	CO ±10%	Electrochemical	–	–	35	200	–	Yes	–	–	–	–	–	–	0.25	0.11	3.20	81	2.20	56	0.86	22	–	-4	122	-20	50	–	–	–	–	CE	2 Years
	Sensorcon INS-CO-01	$154.00	Sensorcon	INS-CO-01	–	Link	Link	–	0	500	1	CO	20	CO ±10%	Electrochemical	–	–	35	200	80	No	No	–	–	–	–	–	0.25	0.11	3.20	81	2.20	56	0.86	22	IP67	-4	122	-20	50	–	No	No	–	CE	1 Year
	TOPTES CT-580	$65.99	TOPTES	CT-580	–	Link	Link	–	0	1,000	–	CO	–	–	–	–	–	–	–	–	–	–	–	–	–	USB-C	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	3 Years
	TOPTES FD-90A-CO	$79.99	TOPTES	FD-90A-CO	–	Link	Link	–	0	1,000	1	CO	30	±5% F.S.	Electrochemical	2.0	No	50	200	–	Yes	–	3.0	24	1,500	Micro-USB	Lithium-ion	0.31	0.14	4.30	109	2.30	58	1.70	43	–	0	122	-18	50	Yes	Yes	–	–	ATEX	1 Year
	TOPTES Guard-101	$94.99	TOPTES	Guard-101	–	Link	Link	–	–	–	–	CO, H2S, O2 and LEL (combustible gas)	–	–	–	–	–	–	–	–	–	–	–	14	–	–	–	1.34	0.61	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	3 Years
	TOPTES Guard-101	$99.99	TOPTES	Guard-101	–	Link	Link	–	0	1,000	1	CO, H2S, O2 and LEL (combustible gas)	60	CO ±10%	Electrochemical	2.0	No	50	200	–	Yes	–	8.0	12	2,000	–	Lithium (non-replaceable)	0.44	0.20	5.12	130	2.56	65	1.77	45	–	-4	122	-20	50	–	–	–	–	CE, UKCA, RoHS, FCC, Ex ib IIB T3 Gb mark	3 Years
	TOPTES Guard-156	$119.99	TOPTES	Guard-156	–	Link	Link	–	–	–	–	CO, H2S, O2 and LEL (combustible gas)	–	–	–	–	–	–	–	–	–	No	4.0	15	–	–	–	1.32	0.60	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	3 Years
	TOPTES Guard-863Pro	$159.99	TOPTES	Guard-863Pro	–	Link	Link	No	–	–	–	CO, H2S, O2 and LEL (combustible gas)	–	–	–	–	–	–	–	–	–	–	2.5	18	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	UL, FCC	3 Years
	TOPTES S2 Multi	$69.99	TOPTES	S2 Multi	–	Link	–	–	0	999	–	CO and LEL (combustible gas)	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	1.18	30	2.36	60	7.48	190	–	–	–	–	–	–	–	–	–	–	3 Years
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