Standard ambient air probe up to +70°C$1.00 Testo 350, Testo 445,Testo 645 – Standard ambient air probe up to +70°C RH (2%) acc. probe Ø 12 mm 0 to 100 %RH -4 to 158°F/ -20 to +70°C (2) Call us for a quote Product Model: 0636 9740 Standard ambient air probe up to +70°C quantity Add to cart SKU: 0636 9740 Category: Testo Sensors Parts & Accessories Tag: Testo Sensors Parts & Accessories Related products 16′ probe connection cable0 out of 5 $105.00 Add to cart O2 Sensor 0-21.0 vol%0 out of 5 $93.00 Add to cart CO Sensor 0-4000 ppm0 out of 5 $176.00 Add to cart