1. Product voorbijview
The Testo 104-IR is a versatile dual-purpose thermometer designed for accurate temperature measurements in various applications, particularly within the food industry. It combines the functionality of an infrared thermometer for non-contact surface temperature readings and a foldable penetration probe for precise core temperature measurements.
Its robust, waterproof design (IP65) makes it suitable for demanding environments, and its compact, foldable form factor ensures portability and ease of use. The device features a clear, backlit LCD display for quick and easy readouts, and it is HACCP compliant, ensuring reliability for food safety applications.

Figure 1: The Testo 104-IR thermometer with its foldable penetration probe extended, showing the digital display.
2. Veiligheidsinstructies
- Always read the user manual thoroughly before operating the device.
- Do not point the infrared laser directly at eyes or reflective surfaces.
- Ensure the penetration probe is clean before and after each use, especially when measuring food items.
- Stel het apparaat niet gedurende langere tijd bloot aan extreme temperaturen of direct zonlicht.
- Use only the specified battery type (2 x AAA batteries).
- Houd het apparaat buiten bereik van kinderen.
- Gooi de batterijen en het apparaat weg volgens de plaatselijke voorschriften.
3. Instellen
3.1 Batterij installatie
- Zoek het batterijcompartiment aan de achterkant van het apparaat.
- Open het batterijklepje.
- Plaats twee AAA-batterijen en let op de juiste polariteit (+/-).
- Sluit het batterijklepje goed.

Figuur 2: View of the battery compartment, showing the placement of AAA batteries.
3.2 Eerste inschakeling
The device automatically powers on when the penetration probe is unfolded. Ensure the display illuminates upon unfolding.
4. Gebruiksaanwijzing
4.1 Infrared (IR) Measurement (Non-Contact)
For quick surface temperature readings, use the infrared sensor. This is ideal for checking temperatures of packaged goods or surfaces without direct contact.
- Ensure the penetration probe is folded in.
- Point the front of the thermometer towards the surface to be measured.
- Press the "ON" button to activate the infrared measurement and laser pointer. The laser dots indicate the measurement area.
- Lees de temperatuur af die op het LCD-scherm wordt weergegeven.

Figuur 3: Close-up view of the Testo 104-IR's top, showing the two infrared laser pointers in operation.
4.2 Penetration Probe Measurement (Contact)
For accurate core temperature readings of semi-solid or liquid substances, use the foldable penetration probe.
- Unfold the penetration probe. The device will automatically power on.
- Insert the probe into the substance to be measured, ensuring the tip is fully immersed to the desired depth.
- Wait for the reading to stabilize on the display. The device has a fast reaction time (t99 = 10 seconds in moving liquid).

Figure 4: The Testo 104-IR in use, measuring the core temperature of a food item with its penetration probe.
4.3 Hold and Min/Max Functions
- HOUDEN: Press the "HOLD" button to freeze the current temperature reading on the display. Press again to release.
- MIN/MAX: While in measurement mode, press the "MIN/MAX" button to cycle through the minimum and maximum temperatures recorded during the current measurement session.
4.4 Uitschakelen
To turn off the device, fold the penetration probe back into its housing. The device will automatically power down.
5. Onderhoud
5.1 Reinigen
The Testo 104-IR is waterproof (IP65 rated), allowing for easy cleaning under running water or with a damp cloth. Ensure the probe is thoroughly cleaned and disinfected after each use, especially when used with food products.

Figure 5: The Testo 104-IR demonstrating its waterproof capability by being rinsed under running water.
5.2 Batterij vervangen
When the battery indicator on the display shows low power, replace the batteries as described in Section 3.1. Always use fresh AAA batteries.
5.3 Opslag
Store the thermometer in a clean, dry place at room temperature. Ensure the probe is folded in to protect it from damage.
6. Probleemoplossing
| Probleem | Mogelijke oorzaak | Oplossing |
|---|---|---|
| Apparaat gaat niet aan. | Batterijen zijn leeg of verkeerd geplaatst. | Controleer de polariteit van de batterijen of vervang ze. |
| Onnauwkeurige metingen. | Probe not fully immersed; IR sensor obstructed; Emissivity setting incorrect (for IR). | Ensure probe is fully immersed. Clean IR sensor. Refer to advanced settings for emissivity adjustment if applicable (not detailed in basic manual). |
| Het scherm is donker of knippert. | Batterij bijna leeg. | Vervang de batterijen. |
7. Technische specificaties
| Parameter | Waarde |
|---|---|
| Measuring Range (NTC Probe) | -58° to 482°F / -50 to +250°C |
| Measuring Range (Infrared) | -22° to 482°F / -30 to +250°C |
| Accuracy (NTC Probe) | ±2°F (-58° to -22.2°F), ±0.9°F (-22° to 211.8°F), ±1% of mv (Remaining Range) |
| Nauwkeurigheid (infrarood) | ±4.5°F (-22° to -4.2°F), ±3.6°F (-4° to 31.8°F), ±2.7°F or ±1.5% of mv (Remaining Range) |
| Oplossing | 0.1°F / 0.1°C |
| Reaction Time (NTC Probe) | t99 = 10 sec (measured in moving liquid) |
| Meetsnelheid | 0.5 seconden |
| Gewicht | 7 oz. (incl. batteries) / 198 g (incl. batteries) |
| Dimensions (probe folded) | Afmetingen: 178 x 48 x 23 mm (7 x 1.9 x 0.9 inch) |
| Bedrijfstemperatuur | -4° to 122°F / -20 to +50°C |
| Behuizingsmateriaal | ABS / TPE / PC, diecast zinc, stainless steel |
| Normen | EN 13485, HACCP Compliant |
| Batterijtype | 2 x AAA-batterijen |
| Levensduur van de batterij | 10 h at 25°C typical |
| Weergavetype | LCD, verlicht |
| Beschermingsklasse | IP65 (waterdicht) |
8. Garantie en ondersteuning
Testo products are manufactured to high quality standards and come with a manufacturer's warranty. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Testo webplaats.
For technical support, service, or calibration inquiries, please contact Testo customer service. Contact information can typically be found on the Testo webop de site of in de verpakkingsmaterialen.
You can visit the official Testo store on Amazon for more information: Testo Store





