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 S1 PM2.5 Air Quality Monitor & Indoor Thermometer

Temtop S1 PM2.5 Air Quality Monitor & Indoor Thermometer

Product ID: 518760764

Details

Battery Description
Alkaline
Brand
Temtop
Lower Temperature Rating
10 °C
Mounting Type
Surface Mount
Operating Humidity
10-99%

🔋60-day battery life with energy-saving tech

🌡️±1°C accurate indoor temperature reading

🌬️PM2.5 laser sensor for precise air quality

€ 62.89

Duties & taxes included

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Stay ahead of the air you breathe—because comfort and health can't wait!

POWER THAT LASTS - Up to 60 days of uninterrupted monitoring on a single charge—no more constant recharging hassle.
COMPACT ON THE GO - Sleek, portable design fits effortlessly in any space—home, office, nursery, or travel companion.
COMFORT MEETS PRECISION - Integrated thermo-hygrometer delivers exact temperature and humidity readings for optimal indoor comfort.
INSTANT AIR QUALITY UPDATES - Quick refresh button delivers the latest air quality and comfort data at your fingertips.
BREATHE SMARTER LIVE BETTER - Real-time PM2.5 and AQI tracking keeps your environment healthy and your mind at ease.

The Temtop S1 is a compact, portable air quality monitor and indoor thermometer that accurately measures PM2.5, AQI, temperature, and humidity. Featuring a high-precision laser particle sensor and digital thermo-hygrometer, it ensures reliable environmental data. With an energy-efficient design, it offers up to 60 days of battery life on a single charge, making it ideal for continuous use at home, office, nursery, or on the move.

Specifications

ASIN	B0CLCL9HH4
Battery Description	Alkaline
Best Sellers Rank	#11,094 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #22 in Indoor Air Quality Meters
Brand Name	Temtop
Customer Reviews	4.0 4.0 out of 5 stars (294)
Included Components	air quality monitor, user manual
Item Highlight	AQI, Temperature & Humidity Monitor, Portable, 60-Day Battery Life, for Home, Office, Nursery & School
LowerTemperature Range	10 °C
Manufacturer	Elitech
Mounting Type	Surface Mount
Number of Items	1
Operating Humidity	10-99%
Part Number	S1
Temperature Accuracy	1 degree Celsius
Temperature Reading Accuracy	plus_minus_1_degree_celsius
Unit Count	1 Count
Upper Temperature Range	50 °C

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Excellent communication throughout the order process. Product is perfect.

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