825-T4 - Food thermometer Testo - Free user manual and instructions

Product Type	Infrared food thermometer with contact probe
Brand	Testo
Model	825-T4
Measurement Type	Non-contact infrared and contact (type K probe)
Temperature Range (Infrared)	-50 °C to +250 °C (up to +500 °C for 5 s)
Resolution	0.1 °C / 0.1 °F
Accuracy	±0.5 °C (-30 to +99.9 °C); ±1 °C or ±1 % of mv (remaining range)
Emissivity	Adjustable 0.20 to 1.00
Optical Ratio (D:S)	3:1
Laser Class	Class 2, <1 mW, 630–650 nm
Battery Type	2 × AAA alkaline
Battery Life	Approx. 20 h (continuous with laser on)
Operating Temperature	0 °C to +50 °C
Protection Class	IP67 (with TopSafe)
Dimensions (approx.)	140 × 50 × 30 mm
Weight (approx.)	100 g (with batteries)
Warranty	2 years
Included Accessories	TopSafe, wall holder, protective cap, frozen food pre-borer, contact probe
Safety Features	Audible and optical alarms for high/low limits
Cleaning	Clean lens with moist cotton swab or compressed air
Adaptation Time	15 min after ambient temperature change

Frequently Asked Questions - 825-T4 Testo

How do I change the emissivity setting on the Testo 825-T4?

Press both buttons simultaneously to enter setting mode, then use the up/down buttons to adjust the emissivity value from 0.20 to 1.00. Confirm by pressing both buttons again.

Can I switch between Celsius and Fahrenheit?

The instrument displays in both °C and °F depending on the selected unit. Refer to the manual for the exact procedure, typically by holding the mode button.

How do I clean the lens of the infrared thermometer?

Use a cotton swab moistened with water or compressed air to gently clean the lens. Avoid abrasive materials and harsh chemicals.

How do I use the contact probe for measuring core temperature?

For frozen foods, use the pre-borer to make a hole, then insert the contact probe into the object. For other foods, press the tip firmly into the item and wait for the reading to stabilize.

What is the warranty period for the Testo 825-T4?

The device comes with a 2-year warranty. Check the specific terms with your retailer or Testo.

What batteries does the Testo 825-T4 use?

It uses 2 AAA alkaline batteries. Observe correct polarity when installing.

Why is the laser not turning on?

Ensure the batteries are fresh and installed correctly. The laser activates when measuring. If still not working, the laser diode may be defective.

Can I measure the temperature of shiny metal surfaces?

Shiny metals have low emissivity. Use adhesive test tape (Part No. 0554.0051) on the surface or use the contact probe instead for accurate readings.

How does the TopSafe protect the thermometer?

TopSafe provides IP67 protection against water and dust. Ensure it is closed properly. Apply grease inside openings if immersing for long periods.

What should I do if the thermometer gives inaccurate readings?

Check emissivity settings, clean the lens, ensure the target fills the laser spot, and allow 15 minutes adaptation time if ambient temperature changed significantly.

USER MANUAL 825-T4 Testo

The measuring instrument conforms with 2004/108/EEC. The instruments were tested in the

27-1000 MHz frequency range. The parameters specified cannot be guaranteed in high frequency ranges.

TopSafe TopSafe Topsafe TopSafe

0554.0825

Wandhalter Wall holder Fixation murale Soporte pared

Schutzkappe Protective cap Capuchon de protection Cabezal protec.

testo 826 T3/T4 0554.0826

Gefriergutvorbohrer Frozen food pre-borer Foret pour surgelés Perforador congelados

Note: The IP 67 protection class is guaranteed only inside the closed TopSafe. If the instrument is kept immersed for a longer period of time, apply grease to inside openings of TopSafe (see arrows).

Battery needs to be changed.

Observe correct polarisation of batteries/rechargeable batteries.

Including optical alarm

Avec alarme optique

Battery life 20 h - Continuous operation - laser

Including audible alarm

Accuracy ±2 °C or 2% of m.v., the larger value applies

±3.5 °F or 2% of m.v., the larger value applies

Emission factor/testo 825 0.2 to 1.0

Emission factor/testo 826 0.2 to 1.6 Emission factor/testo 826 fixed at 0.95

Opening ratio Ratio distance/cible L:D = 3/1

Ratio distance/cible L:D = 3/1 Proporción obertura L:D = 3/1

Laser - Laser Laser - Láser

Wellenlänge

Wavelength

Longueur d'onde

Longitud de onda

Leistung

Power

Alimentation

Potencia

Norm

Standard

Standard

Estándar

Klasse

Claass

Classe

Clase

testo 825-T2/-T4 / testo 826-T2/-T4

Laser beam! Do not look at beam.

Measuring range -50 °C to +250°C (to 500°C max. 5 s)

-58 °F...+482 °F (to 932 °F max. 5 s)

Etend. de mesure - 50°C... +250°C (500°C max.

pendant 5 sec.)

Rango medición -50 °C a +250°C (a 500°C max. 5 s)

Auflösung

Resolution 0.1 °C Résolution 0.1 °F

Resolución

Accuracy ±(1°C +1% of m.v.)

±(1,8 °F +1% of m.v.)

Précision ±(1°C + 1% v.m.)

the larger value applies

±0.9 °F (-22 to +212 °F)

± 1.8 °F or ± 1% of m.v.(remaining range)

the larger value applies

Précision

±0,5°C (-30...+99,9 °C)

Refer to reference material for the emissivity of the substance to be measured or determine via comparison measurements.

Comparison measurement: 1. Surface contact measurement at one point; 2. Infrared measurement on the same point. 3. Keep changing until readings 1 and 2 are the same.

The emissivity in testo 826 is set at 0.95 which is ideal for measurements on food or on coloured packaging. Use testo adhesive tape Part no. 0554.0051

( = 0.93) on objects with an emissivity below 0.2, e.g. shiny metallic objects, for non-contact measurement or only measure with the contact side.

Segment test appears

Beachten:

- Use the pre-borer supplied when measuring the core temperature in frozen food (testo 826 T3/T4). Then place the measuring tip in the object to be measured (Fig. 2).

- Risk of injury from measuring tip (testo 826 T3/T4)

- Maximum ambient and operating temperature (e.g. protect instrument from sunlight)

- The instrument needs an adaptation time of 15 minutes for infrared measurement if the ambient temperature changes (change of location, e.g. measurement inside/outside).

Attention:

- Heat on the heat sensor

- Sharp edges - Do not damage cross-band tip (testo 825 T3/T4).

- Dirt on the lense

Cleaning the lense:

- Clean with cotton buds (made moist with water) or with compressed air.

Eviter: