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Temtop S1-up Review: Compact PM2.5 and AQI Monitoring

The Temtop S1 is a pocket-sized particle monitor that doubles as a thermo-hygrometer. This review covers the sensor, the energy-saving design that gives it a 60-day battery figure, what the S1-up naming refers to, and who should buy it instead of a CO₂ monitor.

By the Akermin Editorial Team · 4 min read

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Temtop S1-up Review: Compact PM2.5 and AQI Monitoring

Temtop · Temtop S1 PM2.5 Air Quality Monitor & Indoor Thermometer

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Price and availability are shown on Amazon and can change at any time.

Verdict

The Temtop S1 is a compact monitor that reads PM2.5, calculates an AQI, and measures temperature and humidity, all on a small display, with a battery the listing rates at up to 60 days per charge. It has no app, no CO₂ and no VOC sensor. The Amazon listing is titled Temtop S1; the S1-up name that Temtop has used for the current revision refers to the same compact design, and this review covers what the listing documents. It suits a nursery, a bedroom or a desk where you want to know whether the air is dusty or smoky and whether the room is too dry, with nothing to configure. If your question is about ventilation, a CO₂ monitor answers it and the S1 does not.

Who It Is For

  • Parents who want a particle reading in a nursery without a glowing screen or a phone app.
  • People who move a monitor between rooms and do not want to charge it weekly.
  • Anyone who mainly wants a good thermo-hygrometer and a particle reading as a bonus.

Documented Specifications

Item Documentation
Particles PM2.5 from a miniature laser sensor, with AQI
Comfort Digital temperature and humidity sensor
Display Shows temperature, humidity, AQI and PM2.5 together
Battery Up to 60 days per charge
Power saving Algorithm reduces laser sensor energy use by 80 percent per the listing
Connectivity None

The Particle Sensor and the Battery Figure

A laser particle sensor works by drawing air past a laser with a small fan and counting scattered light pulses. The fan and laser are the main power draw in any particle monitor, which is why most of them live on USB. Temtop’s approach in the S1 is to run the sensor intermittently: the algorithm the listing describes cuts sensor energy use by 80 percent, which is how a small battery reaches 60 days. The consequence is that the PM2.5 number updates at intervals rather than continuously, so the S1 is a trend monitor. It will show that a room got smoky during cooking; it will not show the second-by-second rise. For most household questions that is fine. Our guide to choosing a PM2.5 monitor explains what optical sensors can and cannot resolve.

Temperature and Humidity

The listing describes a digital temperature and humidity sensor that Temtop says is more accurate than a traditional hygrometer. Digital sensors of this type are the standard in consumer monitors and are typically good to within a few percent relative humidity. The practical use is comfort and mould-risk awareness: a nursery that drops below 30 percent RH in winter, or a bedroom that sits above 65 percent, is a room to act on. Placement matters; keep the unit away from windows and heat sources. See how to measure relative humidity correctly.

What the AQI Number Means

The S1 converts its PM2.5 reading into an AQI value on the display. AQI is a scale that maps concentration to health bands, so the same colour scheme used by weather apps applies. It is calculated from PM2.5 only on this monitor, so it will not reflect ozone or other gases the way a public AQI does. Treat it as a friendlier way to read the particle number.

Placement and Everyday Use

Because the S1 runs on battery, it can sit where the question is: on a nursery shelf, on a desk next to a printer, or in a kitchen doorway to see how far cooking particles travel. Keep it out of direct sun and away from a humidifier, since optical sensors read mist as particles. Owners typically charge it once a month or so and otherwise leave it alone, which is the point of the design.

Strengths

  • Laser PM2.5 with weeks of battery life, which is rare.
  • Small, portable and simple.
  • Good comfort readings on the same screen.

Limitations

  • No CO₂, VOC or formaldehyde.
  • No app, history or export.
  • Intermittent sampling smooths short particle events.

How It Compares

The Temtop S1+ adds app connectivity and is sold in a combo with the T1 thermometer. The Temtop P1 adds PM10, a Bluetooth app with export and audible alarms in a larger body. The Temtop M10+ adds CO₂ and TVOC with an e-ink screen. The S1 is the simplest and smallest of the group.

How We Research

This review is based on Temtop’s published specifications, the Amazon listing titled Temtop S1 and owner reports. We did not run laboratory tests.

Temtop S1+ Air Quality Monitor T1 Themometer Combo, S1+ Indoor Air Quality Meter with PM2.5, AQI, and T1 with Temperature, and Humidity Detector

Temtop S1+ Air Quality Monitor T1 Themometer Combo, S1+ Indoor

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Temtop P1 Portable Air Quality Monitor with LoRa Connectivity

Temtop P1 Portable Air Quality Monitor with LoRa Connectivity

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Temtop M10+ 6-in-1 CO2 Meter & Indoor Air Quality Monitor

Temtop M10+ 6-in-1 CO2 Meter & Indoor Air Quality Monitor

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Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.

Frequently Asked Questions

What is the difference between the S1 and the S1-up?

The Amazon listing is titled Temtop S1. Temtop has used the S1-up name for the current revision of the same compact monitor. This review treats them as the same product and describes what the listing documents.

Does the S1 measure CO₂?

No. It measures PM2.5, calculates AQI, and reads temperature and humidity. For CO₂ look at the Temtop C1+ or the P2.

How does it run for 60 days on a particle sensor?

The listing states that an algorithm cuts laser sensor energy use by 80 percent, which in practice means the sensor samples at intervals rather than running continuously.

Does it have an app?

No. The S1 is display-only. The S1+ is the app-connected version in the same family.

Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.