What should I pay attention to before using the CT-300?

Please open the CT-300 in clean air (such as outdoors with ventilation) and wait for the preheating to complete, which is expected to take 5 seconds.

Why do I smell gas leakage but the CT-300 doesn't display any values?

Carbon monoxide is a colorless and odorless gas. The odor you're smelling may not be from carbon monoxide gas. Try using a combustible gas detector for testing.

Why can't carbon monoxide be detected in a closed room?

When there is no significant source of combustion indoors, even in a closed room, carbon monoxide will not be generated. The gases exhaled by humans contain carbon dioxide (CO2), which is a different gas from carbon monoxide (CO).

Why can't carbon monoxide be detected even when there is a combustion source present?

Not all combustion produces CO gas, only incomplete combustion does, which is characterized by a red/yellow flame in most cases. Also, ensure proximity during measurement to prevent gas dispersion, which may lead to undetectable concentrations.

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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

Product ID: 600927207

Details

Alarm
Audible Visual
Brand
TOPTES
Colour
Orange
Item weight
0.3 Kilograms
Number of items
1
Operating humidity
90 percent

⚡0-5000 ppm ultra-sensitive range

🔊Dual audible & visual alarms

🔋40-hour battery life with auto power-off

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚨 Stay Ahead of Invisible Danger — Safety That Travels With You

DUAL ALARM SYSTEM - Visual color-changing screen plus loud audible alerts ensure you never miss a dangerous CO spike.
BACKLIT LCD DISPLAY - Clear, easy-to-read screen even in dim environments keeps you informed anytime, anywhere.
PORTABLE DURABLE DESIGN - Compact, anti-slip ABS/PC casing built for home, car, camping, and travel—safety wherever you go.
SWIFT PRECISE CO DETECTION - Electrochemical sensor delivers rapid, accurate readings from 0 to 5000 ppm—early warnings that save lives.
USER FRIENDLY POWER MANAGEMENT - 40 hours runtime with low-battery alerts and automatic shutoff to maximize battery efficiency.

The TopTes CT-300 is a portable carbon monoxide detector featuring an advanced electrochemical sensor with a detection range of 0-5000 ppm. It combines audible and visual alarms for immediate alerts, a backlit LCD for easy reading, and a durable, compact design ideal for home, car, camping, and travel use. Powered by three AAA batteries, it offers up to 40 hours of continuous operation with smart power-saving features and low battery warnings, ensuring reliable protection against CO poisoning wherever you are.

Specifications

ASIN	B0CL9MV4MG
Alarm	Audible, Visual
Best Sellers Rank	128,424 in DIY & Tools ( See Top 100 in DIY & Tools ) 135 in Carbon Monoxide Detectors
Brand	TOPTES
Colour	Orange
Country of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (1,078)
Included Components	1x CT-300 Carbon Monoxide Detector, 1x Protective Case, 1x User Manual, 3x AAA Batteries
Item Weight	0.3 Kilograms
Manufacturer	TOPTES
Manufacturer Warranty Description	A 36-month after-sale service and lifetime technical support.
Model Number	CT-300
Number of Items	1
Operating Humidity	90 percent
Part Number	CT-300
Power source	Battery Powered
Product Style	CT-300 CO detector
Sensor Type	Electrochemical
Unit Count	1.0 count

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