Can this detect cigarette smoke specifically?

If by "detect cigarette smoke specifically" you mean, does the Temtop list the specific causes of unhealthy air, no it doesn't. However, it will change the level of air polution when cigarette smoke or other polutants in the air in 2 specific readings: the level of PM2.5 polutants, listing them as healthy or unhealthy, and of AQI of Air Quality Index, listing it as good, moderate or dangerous. I find it extremely helpful.

Why did the manufacturer unnecessarily shrink the third digit in 3 of the 4 fields? Looks unattractive.

I imagine it was a better alternative than using space for a decimal point.

What type/size of battery is used? How many batteries are required? Are the batteries replaceable? Assuming rechargeable type, any limit on max mAH?

It's a built-in rechargeable battery. Uses USB-C to charge. Battery life is quite good.

Most of the reviews complain that the battery has a short life. Would there be any problem if I left it plugged in 24/7?

Keeping the AirTemp on 24/7 will dramatically shorten its life. However, it is very easy to turn on and off. I turn mine on for a minute or two three times a day which lengthens total battery life from as little as 4 hours to as long as more than a year.

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Temtop Air Quality Monitor, Indoor Thermometer Portable AQI PM2.5, Temperature, Humidity Detector for Home, Office or School, Air Quality Tester, Battery Powered, Magnetic Suction

Temtop Air Quality Monitor, Indoor Thermometer Portable AQI PM2.5, Temperature, Humidity Detector for Home, Office or School, Air Quality Tester, Battery Powered, Magnetic Suction

Product ID: 518760764

Details

Brand
Temtop
Color
Verbal status
Item Weight
5.6 ounces
Operating Humidity
80 percent
Upper Temperature Rating
35 Degrees

🔋30-day battery standby

🌡️Temp & Humidity precision

🌬️Real-time PM2.5 AQI detection

Description

🌿 Stay ahead of the air you breathe—because fresh air is the new luxury.

AFFORDABLE INNOVATION - Cutting-edge sensor tech at 38% lower production cost means premium air quality monitoring without the premium price.
UNMATCHED BATTERY LIFE - Energy-saving tech powers up to 30 days on a single charge—stay informed without interruptions.
PRECISION YOU CAN TRUST - Advanced laser particle and Sensirion sensors deliver accurate temperature, humidity, and air quality data.
SLEEK PORTABLE DESIGN - Compact, lightweight, and magnetic suction for effortless placement anywhere—home, office, or school.
BREATHE SMARTER LIVE BETTER - Monitor PM2.5 levels instantly to protect your health from invisible pollutants.

The Temtop Air Quality Monitor S1 is a portable, battery-powered device that accurately measures PM2.5 levels, temperature, and humidity using advanced laser and Sensirion sensors. Designed for home, office, or school, it features a magnetic suction for versatile placement and offers up to 30 days of standby time thanks to its energy-saving algorithm. This cost-effective monitor ensures real-time air quality insights to help you maintain a healthier environment.

Specifications

ASIN	B0BQW2BX6W
Best Sellers Rank	#14,741 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #26 in Indoor Air Quality Meters
Brand Name	Temtop
Color	Verbal status indicator
Customer Reviews	4.4 4.4 out of 5 stars (802)
Included Components	air quality monitor, user manual
Item Length	5.2 Inches
Item Weight	5.6 ounces
Manufacturer	Elitech
Model	S1
Operating Humidity	80 percent
Part Number	S1plus
Smart Home Compatibility	Not Smart Home Compatible
Unit Count	1 Count
Upper Temperature Range	35 Degrees Celsius

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