• Release Date
• Specifications
• Buy It
• News
• HOW TO USE
• HA Interface
• Technical documentation
• FAQ
• Is the probe head water proof? Could I use this in a misting chamber where at times the sensor head could be saturated?

Driven by our passion for sensors, we have manufactured and shared a wide range of temperature and humidity sensors. The THS1 was our first probe-style sensor; whilst the SHT40 sensor it utilised was impressive, the waterproof probe did compromise humidity accuracy. With the subsequent THS45, we found what we consider to be a more perfect probe: these are completely exposed to the air and feature a 1-metre-long cable; in testing, they performed exceptionally well. However, the SHT45 is quite expensive. So, returning to our original aim, we now wish to share the THS40, which utilises the same packaging technology as the THS45. It offers the same value for money as the THS1, but like the SHT45, it is not waterproof. These sensors are in direct contact with the air, maximising their ability to detect temperature and humidity.

Its temperature and humidity performance is slightly inferior to that of the SHT45, but it is entirely sufficient for everyday use. Thanks to the probe’s isolation, the ESP32’s temperature will no longer be an issue.

Furthermore, the combination of ESPHome and Wi-Fi means there is no need to worry about battery drain or slow refresh rates.

In short, I believe this is an interesting, cost-effective, high-performance temperature and humidity sensor, and we invite everyone to explore it with us.

In terms of firmware, we have utilised the same technology as the THS45, with adjustments to the update strategy.

Release Date

27 May 2026 Published.

Specifications

Buy It

https://shop.screek.io/products/ths40

News

Title	Date
🍳 [THS45]This seems to be the best DIY temperature and humidity sensor we’ve made so far, the THS45. Their humidity performance is top-tier—almost like clones.	Apr 26, 2026 9:35 AM
🦃 When looking for a better temperature and humidity sensor, the SHT45 offers excellent humidity performance.	Apr 21, 2026 11:15 PM
⚡ The THS45 is the sensor with the highest humidity accuracy we have ever manufactured; the THS-M45, which features a modified sensor chip, is the next best in this regard.They all use the SHT45 sensor.	Apr 9, 2026 2:54 AM
Process optimization is complete, and the first batch of THS45 (SHT45 high-precision temperature and humidity sensors) has been manufactured. THS45 will now enter regular production cycles. Happy exploring!	Jan 12, 2026 11:07 AM
Introducing the SCREEK Temperature and Humidity Sensor THS45! Powered by the high-precision SHT45 sensor and utilizing ESPHome and WiFi technology for communication. Come explore!	Jan 9, 2026 11:44 AM
THS45 reference comparison: The SHT45 sensor used shows readings close to the SHT40, with slight differences in humidity.	Jan 3, 2026 12:51 AM

HOW TO USE

1. Power on the device.

The device will create a Wi-Fi hotspot named SCREEK-THS40.

2. Connect to the hotspot SCREEK-THS40 using your phone or computer.

A setup page should open automatically.

3. If the setup page does not open, open a browser and go to:

http://192.168.4.1

4. Select the same 2.4 GHz Wi-Fi network used by your Home Assistant and enter the password.
5. After connecting to Wi-Fi, the device will be automatically discovered by Home Assistant.

That’s it. Your device is now ready to use.

HA Interface

Technical documentation

FAQ

Is the probe head water proof? Could I use this in a misting chamber where at times the sensor head could be saturated?

It may be extremely non-waterproof since protective measures for the chip itself have been eliminated. In contrast, the Sht40 probe we used earlier (THS1 sensor) featured rigorous safeguards, though at the cost of some responsiveness. As part of our exploration process, we'll observe its performance alongside early adopters. It must be acknowledged that this approach to chip handling renders it fragile and requires careful handling.