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Temtop S1+ Review: Bluetooth Particle Monitoring for Indoor Use

The Temtop S1+ is the app-connected version of the compact S1 particle monitor. The Amazon listing bundles it with the T1 thermometer-hygrometer, which has its own 180-day battery and 100-day history. This review explains what each unit does and whether the pair makes sense.

By the Akermin Editorial Team · 4 min read

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Temtop S1+ Review: Bluetooth Particle Monitoring for Indoor Use

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

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

Verdict

The S1+ is the compact Temtop particle monitor with app connectivity added. It reads PM2.5, calculates AQI, and measures temperature and humidity with what the listing calls a Swiss-made sensor. The Amazon listing linked here is a combo that adds the T1, a small thermometer-hygrometer with a stated ±0.5°F and ±3% RH accuracy, 100 days of exportable history and up to 180 days of battery. Together they suit a household that wants a particle reading in the living room and a comfort logger in a nursery or greenhouse. Neither measures CO₂. If the app and the second sensor are not useful to you, the plain S1 does the particle job for less.

What Is in the Combo

Item S1+ T1
Measurements PM2.5, AQI, temperature, humidity Temperature, humidity
Comfort sensor Swiss-made per the listing Swiss-made, ±0.5°F, ±3% RH
History Via app About 100 days, viewable and exportable
Battery Rechargeable 800 mAh, up to 180 days per Temtop lab data
Firmware OTA via app OTA via app
CO₂ No No

The S1+ Itself

Functionally the S1+ mirrors the S1: a miniature laser particle sensor for PM2.5 with an AQI conversion, a digital comfort sensor and a small display. The difference is that readings reach the Temtop app, where you can see history and receive updates. The particle sensor samples intermittently to protect battery life, so the S1+ is a trend monitor rather than a live meter. For a family wanting to know whether the air purifier is keeping up during wildfire season or whether cooking is reaching the bedroom, that is enough. Details on optical sensors are in choosing a PM2.5 monitor.

The T1 Thermo-Hygrometer

The T1 is the more precisely specified of the two devices. Its stated ±0.5°F and ±3% RH accuracy is in the range of a good consumer hygrometer, and its 100 days of history with export makes it a practical data logger for a nursery, a wine store, a greenhouse or a room with a damp problem. Battery life up to 180 days, from an 800 mAh cell, means you can leave it in place for a season. Temtop notes the figure is from its own lab data and that real-world use varies. Our guides on choosing a humidity meter and calibrating a hygrometer cover how to check a unit like this.

The App and Connectivity

Both units use short-range wireless to a phone rather than Wi-Fi, so there are no remote alerts while you are away. The trade-off is simplicity: no account, no hub, and firmware updates when you open the app. Owners who want remote alerts should look at a Wi-Fi monitor; see Bluetooth versus Wi-Fi monitors for the reasoning, which applies equally to particle monitors.

Using the Pair Together

The combination makes most sense when the two devices answer two different questions in two different rooms. A common arrangement is the S1+ in the living room or kitchen, where particles from cooking and outdoor smoke are the concern, and the T1 in a nursery, a cellar or a room with a damp wall, where humidity over time is the concern. The T1’s long history is the tool for the second job: a month of readings shows whether humidity sits above the mould-risk range overnight, which a spot reading cannot. If both questions belong to the same room, a single multi-sensor monitor with CO₂ may serve better than this pair; see choosing an indoor air quality monitor.

Strengths

  • Particle monitor and a well-specified comfort logger in one purchase.
  • Long battery life on both units.
  • App history and OTA updates without a cloud account.

Limitations

  • No CO₂ or VOC on either device.
  • Short-range connectivity only; no remote alerts.
  • The combo listing means paying for the T1 whether or not you need it.

How It Compares

The Temtop S1 is the display-only version. The Temtop P1 adds PM10, alarms and Bluetooth export in a larger portable body. The Temtop C1+ is the CO₂ counterpart with the same style of app. Pick the S1+ combo when you want particles in one room and a comfort log in another.

How We Research

This review is based on Temtop’s published specifications, the Amazon combo listing and owner reports. We did not run laboratory tests. Accuracy figures quoted are the manufacturer’s.

Temtop S1 PM2.5 Air Quality Monitor & Indoor Thermometer

Temtop S1 PM2.5 Air Quality Monitor & Indoor Thermometer

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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 C1+ CO2 Monitor, Smart Indoor Air Quality Monitor with BLE App

Temtop C1+ CO2 Monitor, Smart Indoor Air Quality Monitor with

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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 in the Amazon listing?

A combo: the S1+ air quality monitor and the T1 thermometer-hygrometer. The T1 is a separate small device for temperature and humidity only.

Which accuracy figures apply to which unit?

The listing gives ±0.5°F temperature and ±3% RH accuracy, 100 days of exportable history and up to 180 days of battery for the T1. For the S1+ it states a Swiss temperature and humidity sensor and PM2.5 with AQI, without separate figures.

Does the S1+ measure CO₂?

No. PM2.5, AQI, temperature and humidity only.

How does the app connect?

Temtop describes the S1+ as the app-connected S1 and the listing mentions OTA updates and data export through the app for the T1. Both use short-range Bluetooth to a phone rather than Wi-Fi.

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.