Humidity /temperature probe ±2%RH probe Ø 21 mm 0 to +100 %RH -4 to 158°F / -20 to +70°C (2)$585.00 Testo 445, Testo 645 Call us for a quote Product Model: 0636 9742 Humidity /temperature probe ±2%RH probe Ø 21 mm 0 to +100 %RH -4 to 158°F / -20 to +70°C (2) quantity Add to cart SKU: 0636 9742 Category: Testo Sensors Parts & Accessories Tag: Testo Sensors Parts & Accessories Description Description Testo 445, Testo 645 Related products O2 Sensor 0-21.0 vol%0 out of 5 $93.00 Add to cart Connector cable high pressure probes0 out of 5 $182.00 Add to cart Self service replacement CO measuring sensor – 325-1 & 325-3 only0 out of 5 $219.00 Add to cart