Testo 872 Thermal Imager Review: Detect Hidden Electrical, HVAC and Building Problems

In electrical systems, mechanical equipment, and building structures, the most dangerous problems are often invisible. Overheating connections, insulation defects, moisture intrusion, or airflow imbalance rarely show visible signs—until damage is already done.

The Testo 872 thermal imager gives you the ability to detect these hidden temperature anomalies early, enabling preventive maintenance and reliable diagnostics.
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• Infrared Resolution: 320 × 240 pixels
• SuperResolution: 640 × 480 pixels
• Thermal Sensitivity (NETD): < 0.05 °C (50 mK)
• Image Refresh Rate: 9 Hz
• Spectral Range: 7.5 to 14 µm
• Focus: Fixed focus

1. Overheating Electrical Connections

Loose terminals or overloaded circuits create dangerous hot spots.
Measuring range up to +650 °C allows reliable inspection of switchgear and electrical panels.

2. Heat Loss in Buildings

Thermal bridges and insulation gaps waste energy.
Field of View: 42° × 30° enables efficient scanning of walls and façades.

3. HVAC Airflow Issues

Detect uneven heating/cooling distribution, duct leaks, and airflow blockages with precise thermal comparison.

4. Moisture Behind Walls

Cold spots often indicate hidden moisture accumulation—helping prevent mold and structural damage.

5. Mechanical Overheating

Monitor motors, bearings, and pumps.
IFOV: 2.3 mrad (1.3 mrad with SuperResolution) enables accurate spot analysis.

• Measuring Range 1: -30 to +100 °C
• Measuring Range 2: 0 to +650 °C
• Accuracy: ±2 °C or ±2% of measured value (whichever is higher)
• Emissivity Adjustment: 0.01 to 1 (manual)
• testo ε-Assist: Automatic emissivity recognition and reflected temperature determination
• Delta T, Area Measurement, Centre Point, Hot/Cold Spot Recognition

• WLAN: Connection to testo Thermography App
• Bluetooth: Data transfer from testo 605i thermohygrometer and testo 770-3 clamp meter
• USB 2.0 micro B
• Smartphone/tablet as second display & remote control
• On-site report generation and sending
• Video streaming via USB or WLAN

• Display: 3.5″ TFT (8.9 cm), QVGA 320 × 240 pixels
• Digital Zoom: 2× and 4×
• Colour Palettes: Iron, Rainbow, Rainbow HC, Cold-Hot, Blue-Red, Grey, Inverted Grey, Sepia, Testo, Iron HT
• Internal Memory: 2.8 GB
• File Formats: .bmt and .jpg
• Export Formats: .bmp, .jpg, .png, .csv, .xls

• Battery: Rechargeable lithium-ion (exchangeable on site)
• Operating Time: 4 hours
• Protection Class: IP54
• Operating Temperature: -15 to +50 °C
• Weight: 510 g
• Dimensions: 219 × 96 × 95 mm

See What Others Cannot See

The Testo 872 thermal imager combines professional image quality, precise measurement technology, and smart connectivity features.

Detect hidden faults early, reduce downtime, improve energy efficiency, and make confident maintenance decisions with reliable thermal diagnostics.