TESTO Pressure dewpoint probe for measurements in compressed air systems specifications :

Humidity – Capacitive :

• Measuring range : 0 to +100 %RH

Pressure dewpoint :

• Measuring range: -20 to +50 °Ctpd
• Accuracy :±0.9 °Ctpd (+5.0 to +50.0 °Ctpd)±1 °Ctpd (0 to +4.9 °Ctpd)±2 °Ctpd (-5.0 to -0.1 °Ctpd)±3 °Ctpd (-10.0 to -5.1 °Ctpd)±4 °Ctpd (-20.0 to -10.1 °Ctpd)
• Reaction time: 300 s