Testo Temperature/Humidity Probe (0636 9735)

The Testo 0636 9735 probe delivers precise temperature and relative humidity measurements in a robust, slim design. Unlike generic sensors, it pairs a fast capacitive humidity element with an NTC thermistor, ensuring reliable readings for HVAC, cleanroom, and laboratory applications.

Highlights

• Temperature range -20 to +70 °C with ±0.2 °C accuracy
• Humidity range 0 to 100 %RH with ±1.0 %RH accuracy
• Rapid response: humidity t90 under 10 seconds
• Durable ABS housing, 12 mm probe head diameter
• 1.5 m cable with Testo proprietary connector

In daily use

Connect the probe to a compatible Testo handheld instrument and insert the 130 mm probe head into the measurement environment. The capacitive humidity sensor and NTC thermistor provide stable, accurate readings across the full range. The slim 12 mm head reaches into ducts and tight spaces, while the 1.5 m cable offers flexibility during spot checks or long-term monitoring.

Full specifications

• Temperature sensor: NTC
• Humidity sensor: Capacitive
• Temperature measuring range: -20 to +70 °C
• Temperature accuracy: ±0.2 °C (at +25 °C)
• Temperature resolution: 0.1 °C
• Humidity measuring range: 0 to 100 %RH
• Humidity accuracy: ±1.0 %RH (10 to 90 %RH at +25 °C)
• Humidity resolution: 0.1 %RH
• Cable length: 1.5 m
• Probe head diameter: 12 mm
• Probe head length: 130 mm
• Operating temperature (probe): -20 to +70 °C
• Storage temperature: -40 to +85 °C
• Protection class: IP30
• Connector type: Testo proprietary plug
• Compatibility: Testo handheld measuring instruments (e.g., Testo 4xx/6xx/7xx series)
• Response time (t90 humidity): < 10 s
• Response time (t90 temperature): < 30 s
• Housing material: ABS

Final note

Engineered for professionals who need dependable temperature and humidity data without compromise.