Testo 0572 6174 small diameter humidity temperature probe with cable testo 0572 6174 p this thin humidity temperature probe is ideal for measuring temperature and relative humidity in storerooms and work rooms its exceptionally small diameter of 4mm makes it possible to measure in confined spaces p p the probe is also suitable for long term measurements and monitoring purposes by mounting it in a pg gland or clamp for example not included the humidity sensor measuring relative humi