testo 0635 1051 Hot Sphere Probe (Ø 3 mm, digital) - incl. temperature sensor, wired, 1 pc.

The testo 0635 1051 is a digital hot sphere probe with a 3 mm diameter sensor, designed for precise air velocity and temperature measurements in HVAC and cleanroom applications. It delivers accurate readings from 0 to +5 m/s with a resolution of 0.01 m/s, and temperature from 0 to +50 °C with ±0.5 °C accuracy.

Advantages

The compact 3 mm sphere minimizes flow disturbance, enabling accurate measurements in tight spaces. The digital interface ensures stable signal transmission over the fixed 1.4 m cable, and the NTC temperature sensor provides reliable thermal compensation.

Suitable for

• HVAC system balancing and verification
• Cleanroom airflow monitoring
• Comfort level measurements in offices and living spaces
• Spot checks in ducts and at diffusers

Key specifications

• Air velocity range: 0 to +5 m/s
• Air velocity accuracy: ±(0.03 m/s + 5% of mv) up to 0.5 m/s; ±(0.05 m/s + 5% of mv) above
• Air velocity resolution: 0.01 m/s
• Temperature range: 0 to +50 °C
• Temperature accuracy: ±0.5 °C
• Temperature resolution: 0.1 °C
• Probe diameter: 3 mm
• Cable length: 1.4 m (fixed)
• Response time t99: 10 s
• Compatible with Testo 400, 440, 480 and other digital Testo handhelds

Recommendations

For reliable air velocity and temperature measurements with minimal flow interference, this hot sphere probe is an excellent choice for professionals who require accurate and repeatable results.