Key facts
- Brand
- testo
- Model
- 826-T1
- Documents
- 2
- Languages
- EN · DE
- Last added
- 2026-10-07
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testo 825-T1-T2-T3-T4 and 826-T1-T2-T3-T4 Infrared Thermometer User Manual
This manual provides operating instructions for testo infrared thermometers models 825-T1/T2/T3/T4 and 826-T1/T2/T3/T4. It details measurement ranges, accuracy, emissivity settings, and operating temperature limits. The device supports both contact and infrared measurement modes, with automatic shut-off and alarm functions. Battery types and life vary by model, and the device is IP67 rated when using the TopSafe cover. Safety warnings include not looking at the laser beam. This manual is written in German.
Read onlinetesto 826-T1 specifications
| IR measurement range | -50 to +300 °C / -58 to +572 °F |
|---|---|
| IR resolution | 0.1 °C / 0.1 °F |
| IR accuracy | ±1.5 °C (-20 to 100 °C) / ±2.7 °F (-4 to 212 °F) at 23 °C |
| Emissivity adjustment range | 0.10 to 1.00 |
| IR measurement rate | 0.5 s |
| Lens ratio (90 % value) | 6:1, opening diameter 12 mm |
| Laser type | single laser (T2/T4) |
| Laser output / wavelength | < 1 mW / 645‑660 nm |
| Temperature sensor type | NTC |
| Temperature sensor range | -50 to +230 °C / -58 to +446 °F |
| Battery type (T1/T3) | 2 × Lithium 2032 |
| Battery life (T1/T3) | ≈ 100 h |
| Housing material | ABS (white) |
| Dimensions (W × H × L) | 33 × 162 × 19 mm |
| Warranty | 2 years |
All testo 826-T1 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
How do I replace the battery?
Turn the instrument off, slide the battery compartment cover down, remove the used battery, insert a new one observing correct polarity, and close the compartment.
What is the infrared measurement range?
The infrared measurement range is –50 °C to +300 °C (–58 °F to +572 °F).
What is the measuring range for testo 825-T1/T2/T3/T4?
The measuring range is -50°C to +250°C (up to 500°C maximum for 5 seconds).
From: testo 825-T1-T2-T3-T4 and 826-T1-T2-T3-T4 Infrared Thermometer User Manual
What is the accuracy for testo 826-T3/T4?
The accuracy is ±0.5°C for the range -30°C to +99.9°C, and ±1°C or ±1% of m.v. for the remaining range (larger value applies).
From: testo 825-T1-T2-T3-T4 and 826-T1-T2-T3-T4 Infrared Thermometer User Manual