Testo 350 SO2 Sensor Upgrade Module (0-5000ppm)$1,974.00 Testo 350 SO2 Sensor Upgrade Module (0-5,000ppm)(1 ppm resolution) p/n 0554 2250 Call us for a quote Product Model: 0554 2250 Testo 350 SO2 Sensor Upgrade Module (0-5000ppm) quantity Add to cart SKU: 0554 22500 Category: Testo 350 Emission Analyzers: Kits Sensors Upgrades Accessories & Probes Tag: Testo 350 Emission Analyzers: Kits Sensors Upgrades Accessories & Probes Related products Testo 340 & 350 CO Replacement Sensor (0-10000 ppm H2 compensated)0 out of 5 $870.00 Add to cart 6′ data bus cable0 out of 5 $210.00 Add to cart Testo 350 NO Sensor Upgrade Module (0-3000ppm)0 out of 5 $1,974.00 Add to cart