TopTes CT-300 Portable Carbon Monoxide Detector, CO Detector with Audible & Visual Alarm, 0-5000PPM, CO Alarm, Backlit LCD Screen, for Home, Car, Camping& Travel (Includes Battery x3) - Orange
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At a glance
- Condition
- New
- Model
- CT-300
- Dimensions
- 2.64 x 1.38 x 6.3 in
- Weight
- 0.3 kg
- Color
- Orange
- Style
- CT-300 CO detector
- Power Source
- Battery Powered
- In the box
- 1x CT-300 Carbon Monoxide Detector1x Protective Case1x User Manual3x AAA Batteries
Features 5
- Carbon Monoxide Detector: TopTes CT-300 is an ideal portable CO tester to help you detect CO gas concentrations timely and accurately, reducing the risk of CO poisoning and protecting your life. It is a must-have tool for homeowners, drivers, campers, DIY-ers, tourists, etc
- Swift & Precise Measurement: The CT-300, with an advanced electrochemical sensor head, swiftly detects CO levels from 0-5000 ppm. Its sensitivity ensures early warnings, allowing timely actions to prevent health risks. Accurate readings empower quick decisions, promoting safety and well-being. Versatile and portable, it guards against CO in various settings, ensuring peace of mind
- Visual & Audible Alarm: The travel CO detector uses both visual and audible alarms. When the concentration of CO reaches the alarm threshold, the screen changes color and emits an urgent alarm sound to alert you of the presence of CO gas in your surroundings, allowing you to promptly detect the danger, protect yourself
- User-Friendly Functions: With high-quality ABS and PC material and anti-slip edge texture, CT-300 is durable and portable; It can be used for 40 hours with new batteries; Low-power indicator will remind you of time to change batteries; It will automatically switch off when not in operation or when no gas is detected within 10 minutes to save power (can be canceled); Backlit screen for easy viewing, adaptable to dim environments
- Correct detection method: You can detect whether the CT-300 is working properly by detecting smoke from cigarettes, or burning organic matter (paper, etc.) in a sealed container. You will receive CT-300 Carbon Monoxide Detector, Protective Case, AAA Batteries, User Manual
Specs 17
| Brand | TOPTES |
|---|---|
| Style | CT-300 CO detector |
| Power Source | Battery Powered |
| Color | Orange |
| Item Weight | 0.3 Kilograms |
| Alarm | Audible, Visual |
| Operating Humidity | 90 percent |
| Sensor Type | Electrochemical |
| Number of Items | 1 |
| Manufacturer | TOPTES |
| Part Number | CT-300 |
| Product Dimensions | 2.64 x 1.38 x 6.3 inches |
| Item model number | CT-300 |
| Batteries | 3 AAA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
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Frequently asked questions
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View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Reliable, quick readings, very sensitive.
Color: Orange
This handheld carbon monoxide detector is a must have if you have any type of gas in your home! I recently renovated my kitchen and switched the oven from electric to propane. While using the oven for the very first time the flame in the oven just didn’t look right to me. I took out the CO detector and confirmed that there were dangerous levels of CO emanating from the oven. Turns out the plumber who installed the oven never converted it from natural gas to propane. This handheld is easy to use, turns on fast and it’s quickly ready to test your appliances.
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Reviewed in the United States on May 26, 2025 by NY Jimmy
Really a very nice CO detector - It could save your life.
Color: Orange
This TopTes CT-300 Portable Carbon Monoxide Detector is really a very nice detector. I can't really report on its efficacy, though. because it is a scientific instrument, and I would need access to a scientific lab to make that kind of determination. However, it does appear to operate well. It has a very clear screen and simple controls, and fits nicely into your hand for use. The added hard, zippered, case is a nice touch, since a tool of this type is best stored in a case when not in use. For traveling, a smaller CO detector, one with rechargeable batteries, might be a tad more desirable to some, but this certainly would do the job.
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Reviewed in the United States on January 2, 2025 by Shopper5
Carbon Monoxide tester does work
Color: Orange
I used this to determine that my oil burning furnace had no carbon monoxide exhaust leaks in the house. To verify that it was indeed working I turned it on and walked to my running car and as I approached the car the tester alarm went off and continued to increase as I got to the back of the car. It seems to only test CO and levels of CO. I was able to Check the entire house fully.
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Reviewed in the United States on February 5, 2026 by Rick
Works - seems to be of good quality and durable
Color: Orange
Just received this and tested it out today. Went thru the simple calibration/set-up and tested it using our gas stove as the source of CO. Worked as described. Have to believe what they state are the specifications and sensitivity since I have no other measurment method to compare against. While the stove burner was lit, I got very low readings of about 2ppm (nice blue flame). When I turned the burner off, (no flame) there was still gas coming from the burner for a split second and the meter reading briefly jumped to 75ppm+. So it works - accuracy seems reasonable.
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Reviewed in the United States on February 18, 2026 by Bob S
Must have carbon monoxide detector
Color: Orange
The media could not be loaded. This has absolutely saved us and brought me so much comfort! We bought an older house and it has a gas water heater, AC / Heater, and gas stove! Our carbon monoxide detector went off and the fire dept had to come out and air out the home! We bought this and I check the water heater closet occasionally especially on nights where my kids have baths. It's easy to use. Easy to read! Very accurate as we tested it initially with the exhaust from my husband's SUV. The dial shows very accurately how much carbon monoxide is present! It has showed a carbon monoxide leak for us twice now! The size is pretty small and compact and the quality is really good! It is also extremely affordable especially when you compare trying to switch to an electric water heater! If you have any gas appliances this is a must have!
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Reviewed in the United States on July 1, 2025 by Alexis Garcia
Does a great job
Color: Orange
I purchased this as a method to pinpoint CO leaks as needed in an RV. The unit works well and I have tested it in an environment with CO and it worked perfectly. Once exposed to CO it takes a few seconds to register. I specifically wanted something with standard batteries because my luck is when I need it rechargeable batteries are dead. This way I can quickly replace them. I read other reviews saying that it didn’t detect CO2 which it isn’t supposed to it detects CO (carbon monoxide) and it performs well. The unit is easily stored and portable. For the price point it is a great value.
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Reviewed in the United States on February 21, 2026 by Michael M.
Impressive CO Monitor
Color: Orange
● Easy to use ● Batteries included ● Rigid zippered case ● Ample instructions ● Default settings are practical (Walked around my vehicle and the >50 ppm alarm sounded when downwind of end of tailpipe.)
Reviewed in the United States on January 22, 2026 by Jim
Inconsistent Readings, not reliable
Color: Orange
I bought this unit because of the great features - Detection of CO, LCD display with multi-color detection alarm, LEL% and compact size. First the good part - Unit is of very good quality and extremely easy to use. However truly disappointed in the sensor capabilities. The sensor is not reliable. I got faulty readings of CO in open areas and the worst part is when you blow on the sensor, it threw a CO alert alarm, so basically I had CO being emitted from my breath which is absurd! I tested this on a car exhaust and the readings were erratic, out of three tests the sensor only detect CO coming out of the car exhaust once. I don't know if I got a bad piece which had a sensor defect however based on what I saw with this item, I will not recommend it.
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Reviewed in the United States on December 9, 2025 by DEFCON