# Smart thermometer and hygrometer X-Sense STH51 — temperature and humidity monitor

**URL:** https://aio.lv/en/product--x-sense-sth51--11094734
**Data updated:** 2026-05-19 00:40 (EEST)
**Category:** Smart Sensors
**Manufacturer:** X-Sense
**Manufacturer code:** STH51
**EAN:** 5906168434921
**Warranty:** 5 Years
**Availability:** Available for order
**Price:** 12.99 €
**Prices and availability valid until:** 2026-07-22 23:59
**Price without VAT (21%):** 10.74 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--x-sense-sth51--11094734

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.89 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

X-Sense STH51 is a smart thermometer and hygrometer for continuous temperature and humidity monitoring. Designed to track indoor climate, it provides current measurements of temperature and relative humidity and can be used in homes, offices, nurseries or storage spaces. The compact device helps users maintain comfortable conditions and protect sensitive items by alerting to notable changes.

## Long description

X-Sense STH51 Smart Thermometer/Hygrometer is a compact device for continuous monitoring of temperature and relative humidity in homes, offices and specialized spaces such as terrariums, greenhouses and incubators. It provides precise local measurements, cloud data export and remote access via compatible apps, and integrates with Amazon Alexa for voice queries.
Advantages
The device uses a high-precision Swiss sensor that delivers temperature accuracy down to ±0.2°C in the main operating range and humidity accuracy as low as ±2% RH within 10–90% RH. It supports cloud data export for long-term analysis, offers instant push notifications when values cross set thresholds, and is powered by two replaceable AAA batteries for up to one year of operation. The compact ABS housing and simple mounting accessories allow flexible placement in small or confined spaces.
Suitable for
Home and office indoor climate monitoring
Terrariums and greenhouses
Incubators and breeding environments
Storage of humidity-sensitive items (e.g., cigars, instruments)
Key specifications
Manufacturer: X-Sensor
Model: STH51
Power supply: 2 × AAA batteries (replaceable), 3 V DC
Battery capacity: 1200 mAh; battery life: up to 1 year
Material: ABS
Operating temperature: -20 to 60°C (-4 to 140°F)
Operating humidity: 0–100% RH
Temperature accuracy: -20–0°C: ±0.2–0.4°C; 0–60°C: ±0.2°C
Humidity accuracy: 10–90% RH: ±2% RH (maximum ±3.5%); 0–10% / 90–100% RH: ±2–3% RH (maximum ±3.5–5% RH)
Indicators: Red/Blue light
Alarm sound: no built-in sound; notifications via app and base station
How to use
Insert two AAA batteries, place the sensor at the monitoring location and follow the companion app instructions to add the STH51 to your account. Configure measurement intervals, threshold values and cloud export in the app. To use voice queries, link the device in the app to your Amazon Alexa account and enable the relevant skill. Position the sensor away from direct heat sources or water to ensure accurate readings.
Usage recommendations
For reliable long-term monitoring, place the device at representative height and location for the monitored environment, avoid direct sunlight and large airflow, and perform occasional battery checks. Use cloud export to keep historical records when tracking changes for plants, incubation or storage conditions.

## FAQ

### How much does the X-Sense STH51 smart thermometer and hygrometer cost, and is it available for purchase?

The price is 12.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 340 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 09.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All X-Sense products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized X-Sense service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11094734/61776194_large.webp