1. Einleitung
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. Packungsinhalt
Prüfen Sie beim Auspacken, ob alle Artikel vorhanden sind:
- Testo 625 instrument
- Tragetasche
- Kalibrierprotokoll
- 3 x AA-Batterien
3. Produktüberschreitungview
The Testo 625 features a clear display and intuitive controls for easy operation. The integrated probe measures humidity and temperature directly.

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

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

Abbildung 3: The Testo 625 Digital Hygrometer being used by a person in an indoor environment, demonstrating its portability.
4. Einrichtung
4.1 Einlegen der Batterie
- Locate the battery compartment on the rear of the instrument.
- Öffnen Sie die Fachabdeckung.
- Insert the three AA batteries, ensuring correct polarity.
- Schließen Sie den Batteriefachdeckel fest.
4.2 Ein-/Ausschalten
Drücken Sie die Leistung Taste (üblicherweise mit einem Kreis und einem vertikalen Strich gekennzeichnet) zum Ein- und Ausschalten des Geräts.
5. Bedienungsanleitung
5.1 Grundlegende Messung
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/ENDE or MENÜ/EINGABE) to cycle through display modes and view these calculated values.
5.3 Alarmfunktion
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-Konnektivität
The Testo 625 is compatible with the Testo Smart App, which enhances its functionality. The app allows you to:
- View and document measurement results.
- Geräteeinstellungen konfigurieren.
- 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. Spezifikationen
| Parameter | Wert |
|---|---|
| Temperaturmessbereich | -20 to +140 °F / -20 to +60 °C |
| Temperaturgenauigkeit | ±0.9 °F / ±0.5 °C |
| Temperaturauflösung | 0.1 °F / 0.1 °C |
| Luftfeuchtigkeitsmessbereich | 0 bis 100 %rF |
| Feuchtigkeitsgenauigkeit | ±2.5 %rH (5 to 95 %rH) |
| Luftfeuchtigkeitsauflösung | 0.1 %rF |
| Gewicht | 7 oz. / 199 g |
| Dimensions (Instrument) | 8.19 x 2.36 x 1.10 Zoll / 208 x 60 x 28 mm |
| Operating Temperature (Instrument) | -4 to +122 °F / -20 to +50 °C |
| Betriebstemperatur (Sonde) | -4 to +158 °F / -20 to +70 °C |
| Gehäusematerial | ABS + PC / TPE |
| Schutzklasse | IP40, IP20 |
| Akku-Typ | 3x AA (Alkaline) |
| Akkulaufzeit | 100 Stunden |
| Lagertemperatur | -4 to +122 °F / -20 to +50 °C |
8. Wartung
8.1 Reinigung
Clean the instrument housing with a damp cloth. Do not use abrasive cleaners or solvents. Ensure no moisture enters the sensor area.
8.2 Batteriewechsel
When the battery indicator appears on the display, replace the batteries as described in Section 4.1. Use only AA alkaline batteries.
8.3 Kalibrierung
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. Fehlerbehebung
9.1 Gerät lässt sich nicht einschalten
- Überprüfen Sie, ob die Batterien richtig und mit der richtigen Polarität eingelegt sind.
- Stellen Sie sicher, dass die Batterien nicht leer sind. Tauschen Sie sie gegebenenfalls aus.
9.2 Ungenaue Messwerte
- Allow the instrument to stabilize in the measurement environment for a few minutes.
- Stellen Sie sicher, dass der Sensor sauber und frei von Verunreinigungen ist.
- Consider if calibration is due.
9.3 Probleme mit der App-Verbindung
- Stellen Sie sicher, dass Bluetooth auf Ihrem Smartphone/Tablet aktiviert ist.
- Make sure the Testo 625 is within range of your device.
- Restart both the instrument and the Testo Smart App.
10. Garantie und Support
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 oder in der Produktverpackung.





