Comparison : Item # 0699 0550, FA 550 Dew Point Sensor
Item # 0553 0552, Portable Network Graphics (PNG) Cable Screwing for FA 550 and VA 550/570
Item # 0699 3390, Standard Measuring Chamber
Item # 0699 3590, High Pressure Measuring Chamber
Item # 0699 3290, Stainless Steel Bypass Measuring Chamber