Profibus DP module (field installable)$540.00 For 6681 Call us for a quote Product Model: 0554 6686 Profibus DP module (field installable) quantity Add to cart SKU: 0554 6686 Category: Testo Sensors Parts & Accessories Tag: Testo Sensors Parts & Accessories Description Description For 6681 Related products SO2 replacement sensor (0-5000 ppm)0 out of 5 $986.00 Add to cart NO low replacement sensor (0-300 ppm 0.1 ppm resolution)0 out of 5 $868.00 Add to cart CO2 replacement sensor kit with board0 out of 5 Read more