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 10.5′ with 13′ stainless braided TC lead 8 pin connector0 out of 5 $420.00 Add to cart O2 Sensor 0-21.0 vol%0 out of 5 $93.00 Add to cart Testo 350XL/335 CO replacement sensor (0-10000 ppm H2 compensated)0 out of 5 $1,264.00 Add to cart