With its extended temperature measuring range of -30 °C to +120 °C and stainless steel probe shaft, it is ideal for use at higher process temperatures and in harsh environments. Thanks to the plug-in system and digital interface, commissioning and probe replacement are exceptionally quick and easy.1 x testo 6605 humidity and temperature probe with stainless steel probe shaft ∅ 12 mm (selectable lengths 200 or 500 mm) and cable (selectable lengths 1, 2, 5 or 10 m), including factory certificate.