1. Inleiding
The Testo 625 Digital Hygrometer is a compact instrument designed for precise measurement of air temperature and relative humidity. It also calculates dew point and wet bulb temperature, providing comprehensive data for assessing air quality in various environments, such as storage rooms or offices. Its robust design and long battery life make it suitable for both quick checks and long-term data collection.
2. Inhoud van het pakket
Controleer bij het uitpakken of alle artikelen aanwezig zijn:
- Testo 625 instrument
- Draagtas
- Kalibratieprotocol
- 3 x AA-batterijen
3. Product voorbijview
The Testo 625 features a clear display and intuitive controls for easy operation. The integrated probe measures humidity and temperature directly.

Figuur 1: Voorkant view of the Testo 625 Digital Hygrometer, showing the display and control buttons.

Figuur 2: Dimensions of the Testo 625 Digital Hygrometer, approximately 8.19 inches in height and 2.36 inches in width.

Figuur 3: The Testo 625 Digital Hygrometer being used by a person in an indoor environment, demonstrating its portability.
4. Instellen
4.1 Batterij installatie
- Zoek het batterijvak aan de achterkant van het instrument.
- Open de klep van het compartiment.
- Insert the three AA batteries, ensuring correct polarity.
- Sluit het batterijklepje goed.
4.2 In-/uitschakelen
Druk op de Stroom button (usually marked with a circle and a vertical line) to turn the device on or off.
5. Gebruiksaanwijzing
5.1 Basismeting
Upon powering on, the Testo 625 will immediately begin measuring air temperature and relative humidity. These values are displayed on the screen.
5.2 Displaying Dew Point and Wet Bulb Temperature
The instrument automatically calculates dew point and wet bulb temperature. Refer to the user interface for specific button presses (e.g., MODUS/EINDE or MENU/ENTER) to cycle through display modes and view these calculated values.
5.3 Alarmfunctie:
The Testo 625 includes an audible alarm to indicate when user-defined limit values for humidity or temperature are exceeded. Consult the device's menu options to set or adjust these limits.
6. App-connectiviteit
The Testo 625 is compatible with the Testo Smart App, which enhances its functionality. The app allows you to:
- View and document measurement results.
- Configureer instrumentinstellingen.
- Store measured values.
- Use your smartphone as a second display for real-time readings.
Download the Testo Smart App from your device's app store and follow the in-app instructions for pairing with your Testo 625.
7. Specificaties
| Parameter | Waarde |
|---|---|
| Temperatuur Meetbereik | -20 to +140 °F / -20 to +60 °C |
| Temperatuurnauwkeurigheid | ±0.9 °F / ±0.5 °C |
| Temperatuurresolutie | 0.1 °C / 0.1 °F |
| Vochtigheid Meetbereik | 0 tot 100% RV |
| Nauwkeurigheid vochtigheid | ±2.5 %rH (5 to 95 %rH) |
| Vochtigheid Resolutie | 0.1 %rH |
| Gewicht | 7 gram |
| Dimensions (Instrument) | 8.19 x 2.36 x 1.10 inch / 208 x 60 x 28 mm |
| Operating Temperature (Instrument) | -4 to +122 °F / -20 to +50 °C |
| Operating Temperature (Probe) | -4 to +158 °F / -20 to +70 °C |
| Behuizingsmateriaal | ABS + PC / TPE |
| Beschermingsklasse | IP40, IP20 |
| Batterijtype | 3x AA (Alkaline) |
| Levensduur van de batterij | 100 uur |
| Opslagtemperatuur | -4 to +122 °F / -20 to +50 °C |
8. Onderhoud
8.1 Reinigen
Clean the instrument housing with a damp cloth. Do not use abrasive cleaners or solvents. Ensure no moisture enters the sensor area.
8.2 Batterij vervangen
When the battery indicator appears on the display, replace the batteries as described in Section 4.1. Use only AA alkaline batteries.
8.3 Kalibratie
The Testo 625 comes with a calibration protocol. Regular calibration is recommended to ensure continued accuracy. Refer to Testo's official guidelines or contact their service department for calibration procedures.
9. Probleemoplossing
9.1 Apparaat gaat niet aan
- Controleer of de batterijen correct en met de juiste polariteit zijn geplaatst.
- Zorg ervoor dat de batterijen niet leeg zijn. Vervang ze indien nodig.
9.2 Onnauwkeurige metingen
- Allow the instrument to stabilize in the measurement environment for a few minutes.
- Zorg ervoor dat de sensor schoon en vrij van obstakels is.
- Overweeg of kalibratie nodig is.
9.3 Problemen met de app-verbinding
- Zorg ervoor dat Bluetooth is ingeschakeld op uw smartphone/tablet.
- Make sure the Testo 625 is within range of your device.
- Restart both the instrument and the Testo Smart App.
10. Garantie en ondersteuning
For detailed warranty information, please refer to the documentation included with your product or visit the official Testo website. For technical support, service, or spare parts, please contact Testo customer service directly. Contact information can typically be found on the Testo webwebsite of in de productverpakking.





