Know the room conditions, set alerts your way
Check temperature and humidity on the screen or your phone, and choose limits that suit your room. PST-WSD400H gives you clear readings and a history in Smart Life, with a choice of two AAA batteries or USB-C power.
Readings right in front of you
The screen displays temperature and humidity, with a choice of °C or °F.
Alert limits for your space
Set upper and lower limits and receive app alerts, with an option to mute the buzzer.
See how conditions change
Review the reading history in the app to follow changes throughout the day.
Flexible power and placement
Use two batteries or USB-C power, and wall-mount the sensor or place it horizontally.
What you need to get started
- Two LR03 AAA batteries supplying DC3V in total, or USB-C DC5V power.
- A 2.4GHz Wi-Fi network and Smart Life or Tuya Smart.
- Place it away from heat sources and ventilation outlets for readings that reflect the room conditions.
Model and connectivity
| Model | PST-WSD400H |
|---|---|
| Connection | Wi-Fi 2.4GHz, IEEE 802.11 b/g/n |
| Power supply | Two LR03 AAA batteries, DC3V total; or USB-C DC5V |
| Temperature measurement range | -10 to +60°C |
| Humidity measurement range | 0-100%RH |
| Temperature accuracy | ±0.5°C |
Power and operating details
| Humidity accuracy | ±5% |
|---|---|
| Operating humidity | ≤90%RH |
| Alarm volume | ≤55dB at 1 metre |
| Data uploads | Every 60 minutes by default; adjustable from 10 to 480 minutes |
| App | Smart Life / Tuya Smart |
In the box
Temperature and humidity sensor, two batteries, two mounting screws, double-sided adhesive and user manual.
Usage guidance
Using your device
Use within the operating humidity limit of ≤90%RH; avoid prolonged operation above it. Cloud history updates every 60 minutes by default, adjustable from 10 to 480 minutes.
Questions to help you choose
Does it run on batteries?
Yes, on two LR03 AAA batteries. It can also run on USB-C DC5V power.
Can I change the history update interval?
Yes. The default is 60 minutes, adjustable from 10 to 480 minutes. Updates are periodic, rather than every second.
Can I set alert limits?
Yes. Set temperature and humidity limits in the app and choose whether the buzzer sounds or stays muted.
How can I use Tuya scenes?
Link readings to scenes with other compatible devices. Fans, humidifiers and external controllers are sold separately; the sensor does not supply power to them.
