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

📱Smart device remote monitoring

🔋Up to 25 days battery life

🌬️Real-time PM2.5 & AQI sensing

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$U3907

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Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Stay ahead of the air you breathe—because your health deserves the best!

POWER THAT LASTS - Choose from 4 smart modes delivering up to 25 days of continuous monitoring on a single charge.
PORTABLE DISCREET - Compact, lightweight design with magnetic suction lets you monitor air quality anywhere, anytime.
CONNECTED CONVENIENCE - Sync with your smartphone or tablet for remote access and real-time alerts wherever you go.
VISUAL CLARITY AT A GLANCE - Large 3.3-inch LCD with clear air quality indicators—know your air status without guesswork.
BREATHE SMARTER LIVE BETTER - Instantly track PM2.5, AQI, temperature & humidity for a healthier environment.

The Temtop 2 Pack S1 Indoor Air Quality Monitor offers precise real-time measurement of PM2.5, AQI, temperature, and humidity using advanced laser sensors and a built-in fan. Its versatile smart modes extend battery life up to 25 days, while a large LCD screen provides intuitive air quality feedback. Portable and magnetic, it’s perfect for home, office, or travel, with smartphone connectivity enabling remote monitoring and data sharing to keep you informed and safe wherever you are.

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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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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