1. Einleitung
The Testo 545 Digital Lux Meter is designed for precise and convenient determination of illuminance in various working environments. This instrument helps assess light conditions to promote productivity, well-being, and health, preventing issues such as concentration problems and headaches. Its app compatibility allows for easy setup, configuration, and data management, turning your smartphone into a second display for real-time monitoring and documentation.

Figure 1.1: Testo 545 Digital Lux Meter with its external sensor.
Hauptmerkmale:
- Präzise Messung: Accurate determination of illuminance for all common light sources according to the V-lambda curve.
- Komfortable Bedienung: Automatic calculation and display of time and point averages, with audible alarm sounds for fast and reliable results.
- Anwendungsvielfalt: Suitable for various environments, especially offices, to optimize light conditions for productivity and well-being.
- LED-Kompatibilität: Compatible with most commercially available LEDs, excluding single-color blue LEDs.
- App-Konnektivität: Seamless integration with a smartphone or tablet app for graph history display, data viewing, storage, and documentation, or as a second display.
2. Sicherheitshinweise
Please read this manual carefully before operating the Testo 545 Digital Lux Meter. Adhere to all safety instructions to ensure safe operation and prevent damage to the device or injury to personnel.
Allgemeine Sicherheitsrichtlinien:
- Do not expose the device to extreme temperatures, direct sunlight, or excessive humidity.
- Vermeiden Sie starke Stöße oder Vibrationen.
- Do not open the device housing. Repairs should only be performed by authorized service personnel.
- Achten Sie darauf, dass die Batterien gemäß den Polaritätsmarkierungen korrekt eingelegt sind.
- Batterien und Gerät sind gemäß den örtlichen Vorschriften zu entsorgen.
- Keep the sensor clean and free from dust or obstructions to ensure accurate measurements.
3. Packungsinhalt
Bitte überprüfen Sie, ob alle unten aufgeführten Artikel in Ihrem Paket enthalten sind:
- Testo 545 Digital Lux Meter instrument
- Transporttasche
- Calibration protocol (CoC)
- 3 x AA-Batterien
4. Einrichtung
4.1 Einlegen der Batterie
The Testo 545 requires 3 AA batteries for operation. The battery compartment is located on the rear of the main unit.
- Suchen Sie die Abdeckung des Batteriefachs auf der Rückseite des Geräts.
- Open the cover by sliding or unlatching it as indicated.
- Insert 3 AA batteries, ensuring correct polarity (+/-) as marked inside the compartment.
- Schließen Sie den Batteriefachdeckel fest.
4.2 Erstes Einschalten
After installing the batteries, the device is ready for its first use.
- Press and hold the power button (usually marked with an ON/OFF symbol) until the display illuminates.
- The device will perform a brief self-test.
- Ensure the external sensor is securely connected to the main unit via its cable.

Abbildung 4.1: Vorderseite view of the Testo 545 main unit, showing the display and control buttons.
4.3 App-Verbindung
The Testo 545 can connect to a smartphone or tablet via the Testo Smart App for enhanced functionality.
- Download the "Testo Smart App" from your device's app store (Google Play Store for Android, Apple App Store for iOS).
- Stellen Sie sicher, dass Bluetooth auf Ihrem Smartphone/Tablet aktiviert ist.
- Power on the Testo 545.
- Open the Testo Smart App and follow the on-screen instructions to search for and connect to your Testo 545 device.
- Einmal verbunden, können Sie view live readings, configure settings, and manage data directly from the app.

Figure 4.2: Using the Testo 545 in conjunction with the Testo Smart App on a smartphone.

Abbildung 4.3: Bspample screenshot of the Testo Smart App interface showing measurement trends.
5. Bedienungsanleitung
5.1 Basic Illuminance Measurement
To take a basic illuminance reading:
- Power on the Testo 545.
- Position the external sensor at the point where you wish to measure illuminance. Ensure the sensor's light-sensitive surface is facing the light source and is not obstructed.
- Allow a few seconds for the reading to stabilize on the display.
- The current illuminance value will be shown in Lux (lx).

Figure 5.1: Measuring illuminance in an office setting with the Testo 545.
5.2 Erweiterte Messfunktionen
The Testo 545 offers advanced functions accessible via the device's buttons or the Testo Smart App.
- Time and Point Averages: The device automatically calculates and displays time and point averages. Refer to the on-screen menu or app interface for specific options to view these averages.
- Hold-Funktion: Press the "HOLD" button (if available, or via app) to freeze the current reading on the display. Press again to release.
- Minimal-/Maximalwerte: The device can track and display minimum and maximum measured values during a measurement session. Access this feature through the menu.
- Datenprotokollierung: When connected to the Testo Smart App, you can log measurement data over time for analysis and reporting.

Figure 5.2: The Testo 545 being used for illuminance measurement on a workbench.
6. Wartung
6.1 Gerät reinigen
To ensure optimal performance and longevity of your Testo 545:
- Wischen Sie das Gerät und den Sensor mit einem weichen, fusselfreien Tuch ab.amp Tuch. Keine Scheuer- oder Lösungsmittel verwenden.
- Ensure the sensor's light-sensitive surface is kept clean and free of dust, fingerprints, or smudges, as these can affect measurement accuracy.
- Do not immerse the device or sensor in water.
6.2 Speicherung
When not in use, store the Testo 545 in its transport bag in a cool, dry place, away from direct sunlight and extreme temperatures.
6.3 Batteriewechsel
Tauschen Sie die Batterien aus, sobald die Anzeige für niedrigen Batteriestand erscheint. Hinweise zum Einlegen der Batterien finden Sie in Abschnitt 4.1.
7. Fehlerbehebung
This section provides solutions to common issues you might encounter with your Testo 545.
| Problem | Mögliche Ursache | Lösung |
|---|---|---|
| Gerät lässt sich nicht einschalten. | Tote oder falsch eingelegte Batterien. | Batteriepolarität prüfen. Batterien gegebenenfalls austauschen. |
| Ungenaue Messwerte. | Dirty sensor; sensor not positioned correctly; external interference. | Clean the sensor surface. Ensure sensor is facing the light source directly. Move away from strong electromagnetic fields. |
| Cannot connect to Testo Smart App. | Bluetooth off; app not updated; device out of range. | Ensure Bluetooth is enabled on both devices. Update the app. Bring devices closer together. Restart both devices. |
| Display shows "OVER" or "---". | Messbereich überschritten. | The illuminance is above the maximum measurable range (100,000 Lux). |
8. Spezifikationen
Detailed technical specifications for the Testo 545 Digital Lux Meter:
| Parameter | Wert |
|---|---|
| Technische Daten | 10.9 x 7.5 x 3 inches (149 x 60 x 28 mm for main unit, 134 x 54 x 23 mm for probe) |
| Artikelmodellnummer | 0563 1545 |
| Batterien | 3 AA-Batterien (im Lieferumfang enthalten) |
| Light Measuring Range | 0 bis 100,000 Lux |
| Genauigkeit | Class C (F1 = 6% V(Lambda) adjustment, F2 = 5% cos-true evaluation, Total ≤ 15%, ±3% of mv ±1 Digit) |
| Auflösung | 0.1 Lux (<10000 Lux) / 1 Lux (≥ 10000 Lux) |
| Gewicht | 1.54 Pounds (288 g) |
| Betriebstemperatur | -4 to +122 °F (-20 to +50 °C) for instrument, -4 to +158 °F (-20 to +70 °C) for probe |
| Gehäusematerial | ABS + PC / TPE |
| Kabellänge | 4.593 ft. (1.4 m) |
| Schutzklasse | IP40 (instrument), IP20 (probe) |
| Akkulaufzeit | 70 Stunden |
| Lagertemperatur | -4 bis +122 °F (-20 bis +50 °C) |
9. Garantie und Support
9.1 Garantieinformationen
Testo products are manufactured to the highest quality standards. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Testo webBewahren Sie Ihren Kaufbeleg für Garantieansprüche auf.
9.2 Kundendienst
If you encounter any issues not covered in this manual or require technical assistance, please contact Testo customer support. Contact details can typically be found on the Testo official webauf der Website oder auf der Produktverpackung.
For further information and resources, visit the Testo Store on Amazon.





