Dilution System Upgrade For Testo 350$1,985.00 Must add release 0452 3555 and must have 0554 0558. For Testo 350 – Dilution System Upgrade -single slot dilution with Selectable Dilution Factors: 0 2 510 20 40. Call us for a quote Product Model: 0554 3555 Dilution System Upgrade For Testo 350 quantity Add to cart SKU: 0554 3555 Category: Testo Sensors Parts & Accessories Tag: Testo Sensors Parts & Accessories Related products 10.5′ with 13′ stainless braided TC lead 8 pin connector0 out of 5 $420.00 Add to cart TC with tube and plug NiCr-Ni0 out of 5 $366.00 Add to cart Connector cable high pressure probes0 out of 5 $182.00 Add to cart