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 9 ft.Hose Extension0 out of 5 $296.00 Add to cart Testo 350 CO2 Filter Material Refill0 out of 5 $119.00 Add to cart Testo 340/350/300 28″ Hi-Temp (5/16″ Dia.) Probe & 7′ Teflon-lined Hose0 out of 5 $1,520.00 Add to cart