Up to 3 temperature or humidity probes can be displayed; data transmission is radio-controlled, i.e. wireless. Measurement data can be transmitted by infrared to the Testo printer. It is also possible, during cyclical printing, to print measurement data once every minute, for example.

testo 635 immediately displays the dewpoint difference between ambient air and the wall surface when analysing moisture on walls and ceilings.

There are precision probes up to -60°C tpd available to inspect pressure dewpoint in compressed air systems. The humidity sensor developed by Testo has proven itself world-wide and has outstanding features in terms of precision, long-term stability, temperature resistance and robustness.

• Testo printer for documenting measurement data on site
• Cyclical printing of readings once a minute, for example
• Measures air moisture, material equilibrium moisture, pressure dewpoint
• Radio probes for temperature and humidity
• Protection class IP54

Technical data:

Probe type Type K (NiCr-Ni):

Meas. range: -200 to +1370°C

Accuracy: ±0.3°C (-60 to +60°C)
±0.5% v.Mw. (remaining range)

Resolution: 0.1°C

Probe type humid. sensor, cap.:

Meas. range: 0 to +100%RH

Accuracy: ±2%RH(+2 to+95%RH)

Resolution: 0.1%RH

Probe type absolute pressure probe:

Meas. range: 0 to 2000 hPa

Accuracy: ±5 hPa

Resolution: 0.1 hPa

Case: ABS/TPE/metal

Dimensions: 220 × 74 × 46 mm

Weight: 428 g

Battery type: alkaline-manganese, mignon, type AA

Battery life: 200 h

Operating temperature: -20 to +50°C

Storage temperature: -30 to +70°C

Warranty: 2 years